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1c:T11b1,こんにちは。2025年度入試で一橋大学商学部に合格したものです。少しでも力になれればと思い回答いたします。

大学入試数学における最も重要なことはいかに多くの解法を身に着けているか、ということなので、高2のうちにフォーカスゴールドの＊4以外は全て解けるようになっているのはとても素晴らしいと思います。また、プラチカも難易度の高い問題が多いですが解けるようになってきているのは良いと思います。

ただ私の経験上、プラチカは思いつきにくい解法を使ったり、解法にたどり着くのに1段階発想を求められる問題がわりと混ざっており、入試本番に近いという利点がある一方で、解法習得にはそこまで向いてなく、汎用性がそこまで高くないという欠点があると思います。そのため、個人的には、フォーカスゴールドの＊4だったり、StepUpに取り組んでみるとさらに解法の引き出しが増え、過去問も徐々に解けるようになると思います。ただ、問題数が多いので＊4やStepUpに関しては分野によって数を絞るのも良いと思います。

先に「プラチカと過去問の間に挟むべき段階があるか？」という問いに回答すると、「絶対に必要ではないが、時間があるなら上級問題精講をやるべき」というのが私の見解です。上級問題精講には、難易度は高いが解法は頻出だったり、工夫の仕方が他の問題に応用しやすい問題が揃っているように感じます。
まとめると、やるべきはフォーカスゴールドの＊4やStepUpで、時間があったり他の問題集もやりたい場合は上級問題精講も並行して解くということになります。

そして、最後に心構えについてですが、もちろん5完を目指す必要はないですし、夏休みの時点では解けないのが普通です。一橋数学では、整数問題と確率の問題が確実に出ます。そして微積、ベクトル、数列が頻出です。これらの分野の中で得意な分野の問題で確実に完答できる状態にしておくと、格段に得点が安定します。問題の難易度としては、「微積」が一橋数学の中では比較的低いとされているので、特段苦手でなければ「微積」を得点源にすることをおすすめします。また、確実に出題される「整数」と「確率」のどちらかまたは両方を得点源にすることを強くおすすめします。これらの範囲を先ほど言ったようにフォーカスゴールドで重点的に学習して下さい。自分も青チャートでこれらの範囲をやり込みました。

これらの分野で2完以上出来れば世界は大きく変わります。120分使って60%取れれば合格ラインは大きく超えられるので、5問見て解けそうな2問または3問に絞って時間をがっつり使って完答を目指すのが良いと思います。残りで部分点を取ったり、(1)で撤退したりすれば、60%以上には自然と届きます。私も過去問演習の際はそうしていました。はじめは時間がきついと思うので120分で演習を打ち切る必要はないですが、なんとなくの時間感覚は持っておいたほうがいいです。

最後に、一橋数学は年度によって難易度の差が大きいです。赤本や青本の難易度を参考にしてほしいですが、2010年代中盤は難しい年が多く、2020年代は比較的難易度が低いです。解く順番はおまかせしますが、数学が仕上がってきたなと思ったら2021年度の過去問を一度解いてみて下さい。それで3完できれば十分に力はついていると思います。2完ならまずまず、1完もしくは0完ならもう少し演習が必要だなと思って下さい。ただ、2025年度は大幅に難化しました。この傾向が続くことも考えられるので数学だけに頼りすぎずに英語も得点源にしておくことをおすすめしておきます。

夏休みはまだ網羅系をやっていも全く問題ありません。過去問が解けないのも普通です。土台は出来ているはずなので焦らずにこれからも頑張って下さい！1d:Te4c,一橋の数学はかなり熟知した方だと思いますので、僕の経験を踏まえて書こうと思います。次のおすすめ問題集は、プラチカ、新スタ演、一対一の3つです（難易度が高い順）。これらの特徴をお伝えしていきます。

プラチカ
個人的に最もおすすめする問題集です。特徴としては、単元別に問題が収録されていて、ほとんどが難関大学の過去問です。大学入試では定石でも、普通に勉強していたら解けるはずのない程度の難易度です。著者の先生にお会いしたことがありますが、この参考書は一橋用に作ったそうです。標問では知ることができなかった、文系数学の常識を学ぶことができます。しかし、問題と解答が単調に書かれているので、問題の本質や解法までのプロセスは自分自身で考え身につける必要があります。それができない場合、「こんなの無理じゃん」とか「思いつくわけないじゃん」となり暗記数学になってしまいます。しかしこの力は今後の演習にも必ず必要な力ですので、このような問題集に一度触れることで養って欲しいです。下記の2冊に進んだ場合でも、過去問に触れる前に絶対にやって欲しい1冊です。

一対一対応の演習
プラチカに対して、一対一は解説がより丁寧です。各問題には解説だけでなく、ポイントや類題など様々な追加情報が載っています。プラチカよりもより受動的に勉強する本です。欠点としては数学1.2.A.B.Cの5冊に分かれていることです。完成にはかなり時間がかかります。また、チャートやフォーカスなどの網羅系からの接続には適していますが、難易度的に考えて標問とそれほど差がないように思えます。

新数学スタンダード演習
これは「スタンダード演習」とは全く別の問題集で、大学への数学シリーズのものです。上の2冊とは大きく異なり、300問という豊富な問題数に重きを置いています。難易度的には一対一に近く、標問で学んだことの復習になると思います。しかし、これも問題数が多く時間がかかってしまいます。

sa さんの習得度によっても異なります。標問を3周はしたもののまだ定着が不安なら新スタで演習してもいいですし、異なった目線で本質を理解したいのなら一対一でもいいです。そのレベル帯は完璧になったのでもう一つ上を目指すためにプラチカに進むこともアリです。決して自身の実力に合っていない本に手を出して欲しいわけではないですし、他教科との兼ね合いもあるとは思いますが、夏休みが終わるくらいにはプラチカに入っていておきたいところです。

また、同じ数学でも確率と整数は注意が必要です。この2単元は上記3つの参考書では詰めが甘くなる可能性がありますので、追加で時間を取る必要があります。一橋では必ず出題されますからね。基本的になんでもいいのですが、僕は「標問整数」と「合格る確率」がおすすめです。この2単元はある程度勉強すれば定石を掴みやすいので、かなりコスパがいいと思います。

他にも数学でわからないことがありましたら、コメントしてください。がんばって！！2:["$","main",null,{"className":"px-4 pt-4 pb-4","children":["$","div",null,{"className":"max-w-3xl mx-auto w-full","children":[["$","div",null,{"className":"mb-8","children":["$","$L7",null,{"href":"https://unilink-app.onelink.me/isbO/h6xeh63x?advice=CgZWbkcZv0MQonkPJZAu","target":"_blank","children":["$","$L8",null,{"src":"/images/web_to_app_banner.jpg","width":3660,"height":1500,"sizes":"100vw","style":{"width":"100%","height":"auto"},"alt":"UniLink WebToAppバナー画像","className":"mb-4 rounded"}]}]}],["$","h1",null,{"className":"text-xl font-semibold mb-2","children":"プラチカか新スタか"}],["$","div",null,{"className":"flex justify-between mb-4","children":[["$","div",null,{"className":"text-left text-xs text-caption","children":["クリップ(",1,") コメント(",1,")"]}],["$","div",null,{"className":"text-right text-xs text-caption","children":"8/5 8:52"}]]}],["$","div",null,{"className":"coach-mark 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mb-2","children":"回答"}],["$","div",null,{"className":"mb-4","children":["$","$L15",null,{"adviserImageUrl":"https://firebasestorage.googleapis.com/v0/b/unilink-48e75.appspot.com/o/images%2Fs_6p2kYQIRnZaRPZttaFquaR4a3mT2.jpg?alt=media&token=065e3c19-a191-4e28-8fa3-9af740196eee","adviserName":"あきら","adviserDepartment":"京都大学医学部","adviceId":"CgZWbkcZv0MQonkPJZAu"}]}],["$","div",null,{"className":"coach-mark mb-4","children":"すべての回答者は、学生証などを使用してUniLinkによって審査された東大・京大・慶應・早稲田・一橋・東工大・旧帝大のいずれかに所属する現役難関大生です。加えて、実際の回答をUniLinkが確認して一定の水準をクリアした合格者だけが登録できる仕組みとなっています。"}],["$","div",null,{"className":"mb-8","children":[["$","div",null,{"className":"leading-loose whitespace-pre-wrap mb-4","children":[["$","div","advice-part-0",{"children":[null,"こんにちは！\n\n先に進めるべきか、それとも今までやった範囲の完成度を上げるべきか悩みますよねー。しかしこれについては明確な答えがあると思うのでそれを話していきます。\n\n\n結論\n先に全範囲を終わらせた方がいいです。\n\n理由\n数学3cでは極限、微分、積分、ベクトル、複素数が登場しますが、これを学ぶことで解き方の幅やできる問題が大幅に増えるからです。また、よく言われることですが、数3は慣れが大事です。そのため今から触れておくと受験期にアドバンテージになります。\nまた、数学には最終的な答えは同じでも、違うアプローチで解ける問題が存在します。特に、一見ベクトルなんて関係ない問題でも、ベクトルで解くと簡単に解ける問題はたくさんあります。そのためベクトルを習得すると解き方の幅が広がります！\nそして、新スタ(大学への数学シリーズ)では答えのアプローチがいくつかある問題が掲載されています。全範囲終わっていると、その答えを見た時に得られるものが多くなります。\n以上が先に全範囲を終わらせた方がいいと思う理由です。\n\nそのあとはプラチカでも新スタでも色々な大学の過去問でも何をやってもいいと思います。\n\n全範囲終わったあとにプラチカか新スタで迷うのならば時間があるので問題数の多い新スタでいいと思います。\n新スタはとても良かったのでオススメです。\n\n頑張ってください！応援してます！\n\n解答が良かったなぁと思ったらファンになっていただけると幸いです。"]}]]}],["$","div",null,{"className":"mb-4","children":["$","$L16",null,{"adviserImageUrl":"https://firebasestorage.googleapis.com/v0/b/unilink-48e75.appspot.com/o/images%2Fs_6p2kYQIRnZaRPZttaFquaR4a3mT2.jpg?alt=media&token=065e3c19-a191-4e28-8fa3-9af740196eee","adviserName":"あきら","adviserDepartment":"京都大学医学部","adviceId":"CgZWbkcZv0MQonkPJZAu","numberOfFan":69,"clipsAvg":4.153846153846154,"adviceRateAvg":4.858823529411764,"profile":"2024年度入学　一年浪人しました。\n返信はその日中に必ずします。\n受験の経験が少しでも皆さんのお役に立てれば幸いです。\n\n得意科目　英語　数学　共通テストの国語　\n苦手科目　記述の現代文と古文\nどちらでもない科目　化学　生物　地理\nできない科目　物理"}]}],["$","div",null,{"children":["$","$L7",null,{"href":"https://ck.jp.ap.valuecommerce.com/servlet/referral?sid=3364577&pid=884970531&vc_url=http%3A%2F%2Fshingakunet.com%2F%3Fvos%3Dnrmnvccp0000100","rel":"nofollow","target":"_blank","children":["$","$L8",null,{"src":"/images/document_request_banner.jpg","width":3660,"height":1500,"sizes":"100vw","style":{"width":"100%","height":"auto"},"alt":"UniLink 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9:36"}]]}],["$","div",null,{"className":"text-xs whitespace-pre-wrap","children":"ありがとうございます\n先取り頑張ります！"}]]}]]}]]}]}],["$","h1",null,{"className":"text-xl font-semibold","children":"よく一緒に読まれている人気の回答"}],["$","div",null,{"className":"mb-8","children":["$","div",null,{"className":"divide-y","children":[["$","div",null,{"children":["$","$L7",null,{"href":"/advice/ilVxr7PU8mTo3dIfmiv8","children":["$","div",null,{"className":"flex items-center py-4","children":[["$","div",null,{"className":"flex-1","children":[["$","div",null,{"className":"mb-1","children":"数学の参考書ルート"}],["$","div",null,{"className":"text-xs text-caption line-clamp-2 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items-center py-4","children":[["$","div",null,{"className":"flex-1","children":[["$","div",null,{"className":"mb-1","children":"一橋志望。プラチカの前に文系数学実力向上編やるかどうか"}],["$","div",null,{"className":"text-xs text-caption line-clamp-2 mb-1","children":"こんにちは！\nまず、先に結論を言うと良問プラチカに入ることをおすすめします。\n\n数学が得意な事は一橋受験にとって最大級の武器となります。個人的な感覚ですが、現役生で得意科目は夏頃には過去問に入れる人が合格率が遥かに高いと感じています。そのための演習としてプラチカは最適です。勿論、実力向上編をやるのも有効な手段だとは思いますが、一橋に入りたいならプラチカの演習を第一とするべきです。\n\n過去問を冬まで取っておくという考え方をする人もいますが、現実はほとんどの現役生が20カ年を終わらせることができていません。そして、本番を突破するには過去問が何よりの特効薬です。特に一橋特有の整数・確率は過去問演習で決まると言っても過言ではありません。そうなたったときに、プラチカレベルの演習を夏までに行ってきた現役生はオープンでも結果を残すことが出来、秋のモチベーション維持にも繋がります。\n\n補足をすると、もしプラチカで挫折しても数学を嫌いになったり、一橋を諦めないでください！プラチカは難しいです。けど、その分大きな実りのある参考書です。だからこそ、早めに付き合ってみるのがいいと思います。無理なら一度棚にしまって、実力向上編を買いに行くのも手だと思います。この大学は数学との付き合い方が合否を左右します。\n\n春、桜舞う国立の街はとても美しく貴方の合格を祝福してくれます。その光景を想起して一層の努力を続けてください。一橋の数学は努力を裏切りません！(世界史は平気で裏切ります…)貴方の合格を祈っています。\n\nあと、国語は割となんとかるので、私大次第ですが比率を落とすのが良いかもしれません。心配する必要はありません。"}],["$","div",null,{"className":"flex 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mb-1","children":"先に結論を述べると、苦手分野は両方やって、得意分野は両方やらなくていいです。\n苦手分野は基礎問題精講→サクシードの順で演習しましょう。\n以下は、激励、結論の理由、そしてちょっとしたアドバイスを書いていきます。\n\n激励\n東大に合格する受験生はこの時期にはもうすでにプラチカを仕上げており、過去問に取り組んでいる場合がほとんどです。そのため、今の質問者さんは他の東大受験生に遅れをとっている状況です。現役で合格するためには本気で勉強をして下さい。\n\n結論の理由\n数学1Aにはいくつかの分野があります。\n質問者さんの得意分野、苦手分野はどこでしょうか？\n得意も不得意も両方やるのはコスパが悪いのでやめましょう。苦手を減らすことがまずは最優先です！\n\n得意分野は伸び代が少ないので、基礎問題精講もサクシードもやるだけ時間の無駄です。\n\n苦手分野は伸び代がたくさんあるので基礎問題精講もサクシードもやりましょう！最初に基礎問題精講で基礎となる部分を習得し、そのあとサクシードで演習するのがいいと思います。問題数が多くて厳しい場合は全部紙に書くのではなく、頭の中で解答の道筋を考えて答えと一致したか、しなかったかを確かめるようにしましょう。そうすれば短い時間で演習ができます。解答の方針がずれてしまっていた問題は必ず印をつけて後日解き直しましょう。この際は紙に書いてやったほうがいいです。\n\nちょっとしたアドバイス\nあやふやな問題はテスト本番では緊張してしまうので解けない可能性が高いです。テスト後に、あれかぁ悔しぃとなりかねません。そのためあやふやな問題をなくすことは大事です。そのためにできることを伝えていきます。普段の演習や模試などで出来なかった問題をコピーしてノートに貼りましょう。そしてそれを週に2回〜3回見て復習しましょう。そうすれば、出来なかった問題を何回も見てやることになるので、ちゃんとできるようになってあやふやさは解消されます。模試や普段の演習で答えを見てこうやるのかぁと思った問題は、あやふやな問題になりがちです。できるとわかるは違うということを念頭において、出来なかった問題はノートに貼って復習することを強くオススメします。\n\n\n現役で東大に合格できるように頑張ってください！\n応援しております！\n\nもしこの解答が良かったと思えたら、ファンになって頂けると幸いです。"}],["$","div",null,{"className":"flex 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items-center py-4","children":[["$","div",null,{"className":"flex-1","children":[["$","div",null,{"className":"mb-1","children":"阪大の数学のルート"}],["$","div",null,{"className":"text-xs text-caption line-clamp-2 mb-1","children":"　大阪大学経済学部のK-ponです。\n　まず基礎問についてですが解法に関して漏れがないかチェックして見てほしいです。完全に完璧にしろとは言いませんがここで漏れがでると今後の勉強に響く可能性があるので少しでも不安があるところ潰したほうが無難かなと思います。\n　次に青チャについてですが基礎問の次の教材としては大丈夫だと思います。青チャ分厚くて量も多いですがここが数学の勉強でも一番大切な部分なのでしっかりして欲しいです。個人的におすすめのやり方はまず例題、練習問題の難易度星1〜星3のところを完璧に仕上げる。星1の難易度は正直わざわざやらなくても分かるという問題もあるので飛ばしてもOKです🙆‍♀️その後星4、5にも挑戦してみるという形です。星4、星5となるとそこそこ難しいのでまずは解答を見て少しずつ理解していければ大丈夫です。エクササイズと総合演習は個人的にはやらなくてもやってもどっちでもいいかなと思います。それ以上に例題、練習問題、特に星1〜星3を完璧にして欲しいです。これを抑えると共通テストの問題もある程度解けるようになると思います！！分野でいうと確率、微積、ベクトル(平面、空間)はよく出るのでしっかり抑えて欲しいです。何度も言いますが青チャでの演習をどれだけしっかり早くやるか入試の結果が大きく変わると思ってほしいです。僕は合格こそしましたがここを疎かにしたせいで数学の点数は本番振るわなかったので、本当にこの過程を大切にして欲しいです！\n　最後にプラチカについてですが文系プラチカは正直に言うと阪大文系数学よりレベルが高いという印象です。文系数学で満点をとりたいなら進めても大丈夫かなと思います。合格点(2完)を目安にするなら理系プラチカ(1a、2b)の方がおすすめです。理系と名前がついていますがこちらの方が少し簡単です。参考書については僕もあまり詳しくないのでネットで検索かけて調べてみた方が良いかもしれません。ちなみに僕は他の大学(神戸、九州、東北)などの過去問を解いてたりもしてみました。演習をしっかりして高3の秋に志望校の過去問が進められるなら理想的なペースだと思います。\n　勉強頑張ってください！阪大で待ってます👍"}],["$","div",null,{"className":"flex 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