I'm preparing mainly for jee mains. So, how should I prepare or do something to perform well in other exams like WBJEE,VITEEe ?

No you don't need to apply any extra effort for these examination your study for jee is sufficient just focus on that as jee is more important don't get diverted from your goal . These options are backup not main .

Dear Siddharth

Siddharth since you are preparing for the national level examination i.e JEE mains then there is nothing special for the preparation of these type of entrance exam because the syllabus is almost the same infact pattern is also same. Only the task which you have to do is to, do the previous year papers of VITEEE and WBJEE such that you may able to come to know about the full scenario of these entrance exams. And before the final day of the exam revise the syllabus and formula well because these are the key roles for fetching the good score in these exams.

All the best