Remember your short term goal is to pass it. It will take longer to learn the inner tricks of the subject.
When you do the mocks don't accept the answers right away, challenge the answers if you are not 100 % sure of it and double check it from your references. I find some stupid explanations and I don't buy it. Analyze your answers : Speak to yourself aloud and say the reason i picked this option is , I thought ...
Also take notes related to missed questions for example the space between the % and = in expressions, method=get but i did not see it, or missing ; on scriptlets and declarations , or repeated page with imports was ok but i did not see the repeating autoflush oops, etc write them down on your boo boo list and read that list before every mock. That is going to improve your score at least by 10++ . Don't get depressed because: you don't understand everything related to
Servlets and
JSP there are 13 objectives and 7.8 is enough to pass it.