GMAT Strategy

I was once thought taking a GMAT course that it can be good strategy to spend more time with the earlier questions (1-10) in both quant and verbal, and then accelerate during the test.
This might be true, since the brain gets more tired as minutes ticks, so maybe it is more safe to spend more time in the beginning of the test??

However, I have taken the real GMAT once and plenty of CATs and every single time I end up with running out of time so I have to quickly random guess the last questions.

For example on the real test, from what I can recall, I had to random guess:
Q: ~5 last questions
V: ~6-10 last questions.

I don't know for sure, but probably those last minute random guesses in each section cause severe penalty in my final score.

According to the first thing above, "spend more time with early questions", I have use a timing strategy like:

(note: time given is what the timer should show after the greater specified problem number)

Quant:
01-10: 45:00
11-20: 25:00
21-30: 15:00
31-37: 10:00

Verbal:
01-10: 45:00
11-20: 20:00
21-30: 10:00
31-41: 10:00

my final score has been below 50%-tile.

however, now when I think about it maybe I should re-think about my timing strategy too. maybe this strategy is one of the main causes of why I usually end up with running out of time (meaning random guessing) at the end of the test.

Accelerating during the test might sound easier than it really is, I mean "how much fast can I make my brain go" without making extra careless mistakes?


Grateful to any comments of the timing above, and suggestions if there are other more recommended approaches!