i am studying toward the OCA and have used the SCJA book and I am now practicing with Whizlabs online sample questions. I find the questions on Whizlabs quite hard and a lot of it was not in the SCJA book.
My background is electrical and electronic engineering but i want to get into software so i have been studying the SCJA for the last few months. I am beginning to think i need a much greater understanding of computer science than what the scja book give me.
any advice on other books that would supplement the scja well and are the whizlabs questions known to be particularly hard?