Can i please get somehelp for rotaitional mechanics and laws of motion these two chapter screw up my mindcan u also plz tell a book for them thanx

The best starting point I would suggest would be the course material at askiitians.com. Please follow the link below:
http://www.askiitians.com/online-study-packages.aspx?topicid=10&utm_source=promo_on_site&utm_medium=homepageshow_desky&utm_campaign=ecom&utm_term=thumbnail&utm_content=free

The best supplementary resource for these two chapters is
Concepts of Physics – Vol 1 by H.C. Verma

These two chapters are very important and if you find the level of discussion in H.C. Verma hard, then you can try Comprehensive physics for class XI by N. Kumar for CBSE board to have more preliminary discussion.

Hope this helps your query.