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Pi Craft
Concept is the powerEvery CSE Mathematics Optional question from 2013 to 2026, mapped to its exact syllabus topic, with solutions and analysis.
High-yield topics
Choose a question type, then tap a topic to open all its PYQs.
Mathematics Optional Syllabus
UPSC Civil Services (Main) — Paper I and Paper II, 250 marks each.
Topic-wise PYQs
Choose a subject, then a topic. Every question asked on that topic from 2013 to 2026 appears below, in the exact wording of the paper.
Download topic-wise PDFs
15 & 20 Mark Questions
Every question carrying 15 or 20 marks in CSE 2013–2026, with the exact topics they come from. Download the booklets or browse subject by subject.
Consolidated booklet · All 13 subjects
408 questions · 6690 marks · topic weightage and exact sub-topics for every subject
Browse by subject
Books for Mathematics Optional
Read free, openly licensed textbooks right here in the app, and see the standard reference books for every subject.
Read free in app
These books are legally free. Their authors released them under open licences that allow sharing, so you can read them here and save a copy. Credit and licence are shown on every book.
Standard reference books by subject
The books in this list are the copyrighted work of their authors and publishers. Pi Craft does not host, sell or distribute them, and nothing here is for sale. The list is a reading guide only.
Buy the original edition from the publisher or a bookstore, or borrow it from a library. If you are a rights holder and have a concern, message us on WhatsApp +91 63506 04539.
Toppers' notes: how they made them
How the toppers prepared
Short, clear reads on the strategies of toppers in UPSC Maths, JEE, NEET, NDA, CUET and the school boards, written in our own words with a link to each original source.
These are our own summaries for learning. All credit goes to the toppers and to the publishers of the original interviews, linked on each post. Marks and ranks are as reported there.
Topic × Year Analysis
Choose a subject to see which topics are asked most often and in which years. Tap any square to read those questions.
Topic frequency by year
Detailed Solution
Detailed solutions to the PYQs, subject by subject. Download the consolidated book, or open the list to pick a single topic.
Module Wise Study Guide
Prepare one module at a time.
UPSC Past Year Papers
The complete Mathematics Optional paper for each year, question by question.
Formulae
Key formulae, standard results and shortcuts for all 13 subjects, written for Mains revision. Choose a subject, search inside it, or download the PDF.