Hi
sahilcisco,
I've been in your situation. I used to overthink a lot of hard questions and eventually used to end up with just 1 or 2 minutes to solve the last 7-8 questions.
But before we go any further, it's important to note that not all practice tests / mock tests give an accurate reflection of your preparation. For example - IMO the GMAT Club CATs have tougher Quants questions than usual (but it's great for practice if you want to aim for Q49 and above). I've read on almost every other forum that The Official GMAT Prep mock test scores are the most reliable.
Also, I haven't given my GMAT exam yet, but I have seen a considerable improvement in my mock test scores and time management during the test.
Here's what I did-
1. I started timing my questions even during my daily practice. I made a routine to solve 10 SC questions in 20 minutes, 10 CR questions in 20 minutes and 3 RC passages in 20 minutes. All the questions were of 600+ level. Similarly, I set a target to solve 30 quants questions (a good balance of almost equal number of DS and PS questions) in 60 minutes. The idea here is to get the mind used to the time constraint. After enough practice, you will be able to just know whenever you spend more than 2 minutes on any question.
2. This brings us on to the 2nd step- what should you do if you see yourself spending more than 2 minutes on a question.
IMO 2 minutes should be enough to know whether you will be able to solve a quants question or not. If you come across a question where you are not able to come up with any approach under 1.5 minutes, I suggest you skip that question. You could utilize that time in solving a question that has a lengthy approach but you're clear about that approach and the steps to be followed.
Please note that GMAT quants questions do not involve very heavy calculations. So if you ever see yourself in such a situation, you can take a moment and review your approach (This has happened with me quite a few times with Probability related questions). It might save you a few seconds which would otherwise be spent on unnecessary calculations.
Unfortunately, I don't have any such tricks if I see myself spending more than 2 minutes on a verbal question. I just remind myself about the time and take a guess.
3. After enough practice of points (1.) and (2.), you will intuitively start spending only around 2 minutes on each question. Thus, you can now declutter your mind during the test by setting a target time for every 10 or 5 questions, instead of tracking 2 minutes on every question.
For example- As soon as the test starts, I set a milestone to complete 5 questions in 10 minutes. So if I see the clock approaching 52 minutes remaining (for quants), I make sure that I am at the 4th or 5th question. Similarly, if I see the clock approaching 42 minutes remaining (for quants), I make sure that I am at the 9th or 10th question. This way I don't have to look at the clock after every question and spend time calculating how much time I've spent. I can now look at the clock after every 3-4 questions and speed up or ease accordingly.
Hope, this is helpful.