DOGLOVER3 hello there! i did the test this year too, and received a first round offer to Suzanne cory! to answer your questions,
1 - i personally didn't use any books to learn vocab, just some vocab lists. i would recommend vocabulary.com or sites like that as they seem to be helpful
2 - the maths was one of the most difficult tests, alongside numerical, for me. i practiced graphs and parabolas, however it was mainly probability. the time consuming part of the test was what made it super hard.
3 - creative was a picture of a girl sitting in an empty theatre, persuasive was whether or not people go to cinemas as much as they used to.
hope this helps, and good luck next year! π