Here’s my few cents:
Since you’ve been preparing for it for the past two years, you most likely already have tons of information in your head. You can focus on your test taking skills.
First you have to establish a baseline data/score of an actual exam, if you haven’t yet.
- Take the exam similar to the one you are taking, there are probably sample test around the internet. Same time as your actual test if possible, if your schedule is from 1-5pm then do it around that time.
- If each set of exam is an hour give yourself an only an hour.
Once you established your baseline you can either add exam questions or shorten your time to add more pressure and get used to it. The idea here is to get your brain used to processing information at a higher rate. Once you get used to, let’s say 100 questions in 45 minutes, and the actual exam gives you an hour for the same items, you’ll have plenty of time to calm yourself down, relax, and double check your work.
You can also then monitor where you often make mistakes and find out why you are making them. You can then practice more of the same type of questions.
Also get yourself familiar with the different types of questions and how to tackle each of them. Also, know the keywords to look out for.
Test taking is a skill. You need to get used to it by practicing regularly.
If you do not have a system or a study schedule yet, have one. Be methodical about it and stick to it. Chart your week, what do you plan to do each day, each hour. Make room for play and relaxation. You can watch documentaries or videos that are related to physics, biology, and chemistry for your break time to maximize your learning time.
Track your progress. It will help you tell where to put your efforts in.
You can also teach what you learn, to someone else or thing, it will help you make connections between different thoughts and ideas together.
That’s it. The more you practice, the luckier you get.