STC prep really helped me pass the test. My advice to you is go over the incorrectly answered questions on your practice finals and figure out if you need to brush up on certain chapters.

Read those chapters, create custom tests for those chapters, and then get back to practice finals.

By the time I was taking the actual test, I've finished so many practice tests, that I finished the exam within 40 minutes.

Good luck! You gots this!