Hello,
First thing: never quit a practice test. If you get frustrated on the real thing, you can't simply "quit". The test is designed to be stressful and put you to your limits in what the test... tests for.
Next: two weeks isn't likely enough time. Are you keeping an
error log? The adaptive nature of the test looks for your weakness and really hinders your ability to score high if you do very poorly in one subsection. The
error log is one of the best tools to identifying the WHY aspect of answering problems incorrectly and moving forward
Finally, don't simply read books for the sake of reading them. Look over your practice tests and use them as a reference for what materials to study. Move from your weakest sections up to your strongest.
Good luck,