The best.I have been issued a J.Coroneos textbook from 1966 lol, Only for complex numbers though. Must say though this book has stood the test of time, its really good imo.
The traditional approach is usually Terry Lee + Past papers (since T.L has colour).we've got fitzpatrick as the school book
apparently its the best for 4u?
then we also have to do cambridge as extra homeworrk
and if we are EXTREMELYY hardworking, Terry Lee