Hello Rimon,

I suggest you start doing all the steps while you are solving problems. If you do a lot of mental calculations its better if you practice a lot it saves a lot of time but at the cost of accuracy. You should read the questions very carefully because in jee in some problems out of the 4 options that you get some are incomplete or you can get a more simplified answer it is a very common mistake.

you can practice meditation to increase your focus and concentration this can help you avoid petty mistakes.

I hope you find this helpful. wish you all the best for all your exams.