I am an IBDP student, currently revising for mocks. I use the haese mathematics textbook and am always shocked by how much effort would have gone into producing this textbook. Out of curiosity, I decided to search the name of the authors up and I came across you Mr. Sangwin! I am just writing this as a thank you for the time that must have taken to produce a textbook of such high quality and hopefully if I meet my offer, see you in September 2024!