A great book to get is the PPL confuser, It has most of the exams with answers, but I must stress that there is no substitute for learning the facts. You will need them so study them. You will not need anything more than the Trevor Thom books and the PPL confuser, don’t be fooled into buying lots of useless stuff and believe me everybody will try to sell you something
Don’t worry about the exams the are real easy.