We are not sure what  you mean by CCG. Please do help us with that. Meanwhile, JEE Mains 2021 will be conducted with reduced and revised syllabus as per an official statement released by the MHRD. And it has invited suggestion from the parents and the sllabus has not been released yet. But CBSE has released its revised syllabus for both Classes 11 and 12 and so you can prepare from this Syllabus. You can check the syllabus at our page: http://cbseacademic.nic.in/revisedcurriculum_2021.html . Until the official JEE Mains syllabus has been released, we would suggest you to stick to CBSE syllabus mentioned here and prepare accordingly. NCERT books will be the best at this point in time instead of going for any publishers because they will still have the old syllabus. Alternatively if you want to prepare for JEE Mains through online, please check out JEE Mains Knockout package: https://learn.careers360.com/knockout-jee-main-april/