I cleared my OCA exam yesterday with 94% score and I am pretty satisfied. I thought to share my experience in a few words.
Durga youtube tutorials - he's english is very hard to understand but he is an excellent beginner's teacher. At first I didn't understand half of thing he was saying (well, I didn't understand the actual words, but got the concepts), but then I get used to it and I understand him perfectly now
Mala Gupta certification guide
Kathy Sierra & Bert Bates exam guide
Jeanne Boyarsky & Scott Selikoff study guide
Jeanne Boyarsky & Scott Selikoff practice tests
and of course Enthuware tests which helped me a lot. Actually, all of these resources helped me a great deal.
Regarding enthuware tests: Recommendation is that you don't do them multiple times. However, if you are a beginner like me, with no real coding experience, You might found it very helpful doing it multiple times. It helped me with "reading" the code and writing it on paper (not in IDE) and also learned many stuff I didn't see in books. As a note, I didn't memorize the answers, each time I was doing the test I was writing the code all over again on the paper and then check if I have the result I got as an answer. Last day exam with unique questions I left for the last day, I did it only once, just to check my knowledge and scored 90% (with few really silly mistakes) so I was a bit relaxed and somewhat convinced that I will pass the next day
You have plenty of time on the exam, I finished it, along with reviewing about half of the questions (real exam is easier than enthuware tests, so I was trying to find what I missed on some really easy questions), 35 minutes earlier, so no need to panic about that
Maybe one more tip: when doing enthuware tests, make sure you know exactly why some answers are wrong or right, there can always be a question where you miss something (like default modifier in another package), but when practicing, take your time and try to explain to yourself why each and every answer is wrong/right
I don't know what you mean by "exam procedure". My first post include what I used as study material, 3 books + 1 practice test book, Durga youtube tutorials (about 100+ hours of that) and enthuware tests, and I did every enthuware and book test.
It took me about 3,5 months to prepare this, with 3 weeks off due to unpredicted circumstances just before the exam, and after that I did only last day exam. I found this off period (from studying) actually beneficial, so I suggest that when you think you are ready, take some time off, a week or two and then try to do enthuware test again. Lots of things really settle and get perfectly clear during this time