I passed with 100% ,i took nearly 1.5 months to study OCP . Depends on you how much time are you going to spend. I studied nearly 6-7 hrs a day including weekends. Nearly 10 ques were from OCA (Inheritance, Overloading and Overriding). And abt 30-35 on Functinal programming. Not many questions on Date and Time,Localization . But
JDBC nearly 6 lengthy questions. IO and Nio questions were not so complicated. So focus more on generics and functional Programming very very important.