I write and check every page of these notes myself, and I can still get something wrong — a date, a name, a chapter a PYQ was mapped to. If you spot one, please tell me below. I will check it against my sources and, if you are right, correct the notes and list the correction here so you can see exactly what changed.

Corrections log

No corrections have been listed yet. When one is made, it will appear here with the date, the subject and chapter, what the notes said, and what they say now.

Which edition do I have?

The current edition is 2026. If you bought an earlier version of a PDF and a correction affects it, write in with your order email and I will look into sending the corrected file.