Knowing the time limits & having a watch with you are 2 of the most important things you can do on the day of the test.
No calculator watches or cell phones allowed but any cheap digital watch with a stopwatch function is going to be fine.
All the sections except Writing have 48 questions, so you should be done with 12 of them by 1/4 time, 24 done by 1/2 time & so on. I only had 19 chemistry answers by 1/2-time so I sped up the 2nd half & barely finished.
Don't expect to finish Math. Make sure you mark every answer - 4 guesses are bound to give you 1 right answer. Math is last & the proctors will come & grab your test book up immediately after time is called. Nice thing is you can answer 50% right answers & make a 76% Math score because i did it.