In order to solve questions it is very important that your basics are clear. If your concepts are clear you can solve tricky questions as well. 

In order to approach your paper it is very important that you should analyse your paper first. Try to answer easy and avearge questions first. It will help you to score good marks. 

Work on your time management. You should allot a time to a specific question and try not to exceed that time.

It is advisable to solve your strongest subject first, followed by your weakest subject and in the end, solve the subject where you’re average. 

You can also score chemistry first as it is highest scoring subject followed by physics and mathematics.

For your practice try to solve as many as mock test series it will help you to increase your speed with efficiency. Do analyze your mock test after completing it to learn from your mistakes and try not to repeat them.

All the best for your preparation!!