Before solving a question always look for methods to insert values inside questions. Solution of triangle questions are easily solvable by using an equilateral triangle.

Apart from this make sure you understand the concept of dimensions from physics and carry it over to maths.

For ex: if you are asked about the length of a segment make sure you check the dimensions of the options. If the input in the questions is a and b which represent length then there should be an option like \frac{a^2+b^2}{\sqrt{ab}} which may be the right option. NTA has caught up to this trick in physics but is still observable in maths.

I know this trick is widely known but in physics. Most people do not realise that you can use it in maths as well.

Lastly if you cannot solve questions of co-ordinate and you see the options only differ in signs, just plot the graphs. For this learn how to plot and analyse graphs correctly.

Mostly, you can atleast determine the rough position of your answer. This is enough to mark your answer in most cases. But identifying which questions to solve and which to apply tricks on is an art in itself.

Also JEE mains is very limited when it comes to syllabus. No need to venture and explore mathematical phenomena outside your syllabus. Once you get into an good college you will get ample opportunities to do so. However people will always work to get ahead of you in JEE mains. So focus there and you may be able to maximise your score.

Also please share any tricks you already use for everyone to benefit and so that we can see what the newer aspirants are doing.

Have a nice day.