hello aspirant......

books for jee mains for hindi medium students in hindi are

physics concepts of physics vol 1 and vol 2 bu h.c.verma problems in general physics by i.e.irondov

chemistry numerical chemistry by p.bahadur organic chemistry by paula bruice

mathematics maths 11 and 12 by ncert trigonometry by s.l.loney coordinate geometry by s.l.loney higher

i hope this information is helpful

all the best.

Hello Aspirant, JEE mains 2020 is conducted by NTA(National testing Agency) in tow phases, the first one in january 2020 and the latter in april 2020, I prefer the NCERT textbooks is a very good choice as handful of questions are asked on theory based in NCERT. For more ways of understanding how the questions are given, you can have a look at disha experts solved papers book.(Hindi).

Hope this helps.

Thank you.