i am findin newton's laws pf motion centre of mass and rigid body dynamics very hard....is there any particular way i can tackle these chapters..??

Though i am not an expert but because i had the same problem so may be you could try  out  my method if you think itz gona b f any help. Go through the solved examples of HCVerma n den try doin a few sums if u can.If ur goin for IITJEE 2010 derz no tym left for doin sums.See solved examples of these topics given in various IITJEE Practice materials.You may go through any material of ur coaching(if u hv ne).C d examples, c hw d sum is being solved,Grab the basic concepts n practice hard n keep ur mind cool.All The Vry Bst 4 watevr ur doin.