Dear aspirant !

Hope you are doing well !

Ya its totally okay and fine . Solving cengage book now will take time ,and you don't have that in your second attempt of jee mains . Beleive me , solve ncert ,read carefully it for chemistry ,even don't leave a single word , all questions will come from ncert in chemistry ,it's my suggestion . For physics ,revise all formulas and do at least 5 problems on every concept . And for maths ,do only jee mains specific topic to get a decent score in it because it is quite tough and lengthy ,focus more on other two subjects .

Hope it helps you !

Thanks