Hope you are doing well.
As far as mathematics subject is concerned being asked in JEE main it's quite easier than the level of questions being asked in JEE advanced. When is JEE advanced ask questions from multi concepts and of much depth JEE main ask questions of almost the same level of your 12th boards and some tricky conceptual questions. Preparing for boards would help you you in your preparations for mathematics in JEE main.
Hope this helps you good luck

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