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.
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.