Apparently you can study the Gravitation without studying the Rotational motion, just by knowing the dynamics such as Centripetal Force, Centrifugal force (just the formulae). But when ever you will try to do the problems, the problems will be linked with many other topics and at that moment, you may need the help of the Rotational Motion in order to solve those problems. So it would be suggested for you that you should follow the sequence and then reach Gravitation, and this way you will get confidence in problem solving.

If you want to get the Class 11 NCERT solutions, you may consider the link provided below:

https://school.careers360.com/ncert/ncert-solutions-class-11

I hope this helps. Wish you a great day!