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IMO the Cambridge 4U isn't very good, at least for the questions (I don't read the theory from there). Certainly not as good as Cambridge 3U (why can't Bill Pender write a 4U textbook tooThe S.K patel one is pretty good for 4unit. It beats all the others I've tried reading
Honestly don't get what understanding means sometimes. From my experience, Cambridge>Fitz> Understanding (xx) Maths, for understanding.
The excel ones are good, they provide step/step solutions.
Because he had a heart attack last year =\ So I'm guessing that his health isn't too good atm...(why can't Bill Pender write a 4U textbook too)