田二
A shelf of 29 original solution books — competition papers worked from first principles and set in LaTeX like a book worth keeping. Physics, astronomy, biology, and mathematics from the world's leading olympiad circuits.
Every question from 17 years of F=ma exams, regrouped by topic with full worked solutions — the definitive study reference for the US Physics Team qualifying round.
A year-by-year archive of every F=ma exam, fully worked — ideal for timed practice and tracking how difficulty has shifted across the circuit.
Every PhysicsBowl question sorted by topic, with thorough write-ups that explain not just the answer but the underlying physics at stake.
Topic-sorted PhysicsBowl solutions at an intermediate depth — concise where clear, expanded where the physics deserves more room.
Compact PhysicsBowl solutions for rapid review — one focused paragraph per problem, no padding, no detours.
Complete worked solutions to every British Astronomy and Astrophysics Olympiad paper — the only such full reference available in English.
Complete worked solutions to all BPhO Round 1 Section 2 papers, arranged chronologically for year-on-year comparison.
BPhO Round 1 Section 1 questions regrouped by topic, with full worked solutions for systematic review of each area.
Year-by-year BPhO Round 1 Section 1 solutions — useful for progressive difficulty tracking and exam-style practice sessions.
Topic-organised solutions to the Senior Physics Challenge — ideal for diagnosing weak areas and building coverage before a sitting.
Chronological Senior Physics Challenge solutions for realistic exam-style practice with a full record of how each paper was set.
Year-by-year Intermediate Physics Challenge solutions — a complete archive for building from the ground up.
Topic-sorted Intermediate Physics Challenge solutions for structured revision — a clear map from topic to mastery.
Ten years of PUPC papers fully typeset with worked solutions — a rare archive of this university-hosted circuit, including problems set by Tian2 in the PUPC Problem Creator role.
2000–2025 AMC 10 problems sorted and fully solved by topic — the most comprehensive AMC 10 reference available, covering 25 years of the competition.
The complete AMC 10 archive in chronological order, fully worked — ideal for year-by-year timed practice.
1,689 pages of competition mathematics — every AMC 12 problem from 2000–2025 sorted by topic with complete solutions.
Every AMC 12 exam in chronological order, fully worked — a complete year-by-year record of the competition.
Every AMC 8 problem grouped by topic with full solutions — the definitive AMC 8 study reference for building from fundamentals.
The complete AMC 8 archive by year, fully worked — straightforward exam-style practice from start to finish.
1,615 pages of fully worked AIME problems — a complete, polished archive of one of the most demanding pre-olympiad competitions.
All USAMO problems sorted by topic with complete proof-level solutions — a landmark reference for olympiad-level mathematical reasoning.
The full USAMO history in chronological order with complete worked proofs — see the evolution of olympiad problem-setting over decades.
Complete worked solutions to the British Biology Olympiad 2019 paper — cell biology, genetics, ecology, and physiology treated with the same rigour as the physics volumes.
Worked solutions to every question from the 2020 British Biology Olympiad — spanning molecular biology, evolution, and systems physiology.
Worked solutions to the extended 2021 online edition of the British Biology Olympiad — the most paper-dense year in the series at 66 pages.
Fully worked BBO 2022 solutions — covering biochemistry, cell signalling, and ecology questions in the competition's characteristically conceptual style.
Complete worked solutions for both BBO 2023 papers — the two-paper format fully unpacked, with explanations that go beyond model answers.
The most recent BBO, fully solved — both papers worked in detail, a current benchmark for what top marks in the British Biology Olympiad require.