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The site is free for personal study. By using it you agree to these terms. If you do not agree, please do not use the site.
Accounts
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The content
The notes, questions, diagrams and videos are written by Muhammad Raheel(opens in a new tab). They follow the PCTB textbooks, and short definitions are quoted from the books with their source. Content follows the PCTB textbooks (2025-26). Not affiliated with PCTB or any examination board.
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Exams and mistakes
Every topic is checked against the book, but mistakes can still happen. Always follow your book and your school for exams. If you find a mistake, please report it: fixes are listed on the Errata page.
What is not allowed
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Links to other sites
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Changes
These terms may change as the site grows. The date at the top shows the last change. Questions? Use the contact page.