If you score like that on the mock exams of enthuware you are ready to go! They are close to the real exam questions and in my case I scored better on the real exam than on all of the mock exams (both for SCJP5 and SCWCD5).
The number of questions in the mock exams about Tag files I can't remember but you will get a few on the real exam. If you check the tag file part in my notes (SCWCD Links) you will know enough for the exam.
Regards and good luck on your exam!
Enthuware Software Support
Joined: Sep 23, 2000
90% on JWeb+ V5 is very good.
Did you try using the "Average Scores" feature in the simulator? Click on it to see the average scores of other JWeb+ users on mocks and the real exam. This will give you a good idea about the difficulty level.