The MHRD did announce that JEE Mains 2021 will be conducted on a reduced and revised syllabus owing to the decreased academic year 2020 due to Corona Pandemic. The department has invited suggestions from the parents. At this point in time, the syllabus hasn't been decided yet. So it is not still unknown what are the topics that might be included and what topics might be omitted. But yes the syllabus will be reduced. So if you are preparing for JEE Mains 2021, stick to NCERT books until the official syllabus has been officially released. But if you have already purchased JEE Advanced books, you can study from them as well because you will get in depth knowledge about each concept. Few topics might not be needed but because we do not know which topics might be reduced and which might not be, we would suggest you to not buy any books atleast until HRD comes with the official syllabus.

Hello,
The concepts in JEE advanced are quite higher as compared to JEE mains. At the very first you need to thoroughly clear the basic concepts from the NCERT books for PCM. After that you can go for higher level books which help you to apply the concepts.
Here's a link for best recommended books for JEE mains. https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/articles/best-books-for-jee-main/amp&ved=2ahUKEwiX-d-b-57qAhXKfn0KHQ3HA9kQFjAAegQIAhAC&usg=AOvVaw1wil8ti_ze9MSV-Wo_mLsd&ampcf=1
Questions in JEE advanced require higher order thinking. So for JEE mains you must specifically practice from books made for JEE mains.

You can go for the Careers 360 online coaching for JEE mains which provides previous year question papers, frequent mock tests and 24x7 doubt clearing. https://www.google.com/url?sa=t&source=web&rct=j&url=https://learn.careers360.com/&ved=2ahUKEwjxlvaf-p7qAhXOR30KHYxKClAQFjABegQIBxAB&usg=AOvVaw1ygKzacnBaQOPGaLiWbSgF

Hope it helps

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