10th grader here, my preboards 2 start tomorrow and im genuinely at a loss

my preboards will end on 20 december, so this is just wasting a lot of my precious time to actually prep for boards. speaking of prep, what do i even do for boards?
for science i just do whatever my tutor tells me so ive got that covered.
for maths ima solve exemplar after preboards 2 end, but what do i do after that? revise ncert + exemplar or start doing pyqs, sqps? also should i try doing rs or rd solved examples?
speaking of pyqs, where do yall do them from? online? some question bank? some previous year papers book?
also ive got 6 subjects- hindi maths science sst english ai, can i replace hindi with best of 5 rule? i genuinely suck at it.