Hi
UnforseenYour frustration reminds me of my own situation when I used to attempt
MGMAT CATs. I faced a similar problem when solving the Quant section.
However, unlike you, I tried to guess a few questions towards the end, just to ensure that I don't leave any questions unanswered. For this reason, I scored 45, 47, 47 and 45 on the four MGMATs I attempted. You might know that there's a heavy penalty in GMAT for questions left unanswered.
I believe that the level of Quant questions on
MGMAT are a bit higher than the actual GMAT. So, I don't see this as an area you need to worry about too much, if you have time in hand to practice. I would suggest you devise a timing strategy for Quant section and strictly stick to it whilst attempting CATs. You might see different timing strategies on this forum and on others. However, you need to test these and decide for yourself which one works best for you. I personally used the below mentioned checkpoints in Quant section in CATs.
Question Number------
Time Remaining--------8----------------------60 minutes
-------18----------------------40 minutes
-------28----------------------20 minutes
-------33----------------------10 minutes
-------35-----------------------5 minutes
The left column shows the question number on which you should be on and the right column shows the time left when you are on that question. I felt that I was on time, on the real GMAT and this strategy worked for me - I managed to score a decent 49. However, you might need to practise and perfect your own strategy.
Even if you are able to guess a few questions on
MGMAT towards the end, do ensure that you evaluate and review all questions and answers after the test, including the one's you guessed. Also, check which type of questions you're taking longer to solve and out of those questions, how many end up being incorrect. This way, you can track your weakness and perhaps try making an educated guess, going forward, instead of spending too much time on it and suffering towards the end because of it.
Hope this information helps you build your own strategy on future CATs and improve your score.

Let me know in case you would like to know anything else in this regard.
Cheers!