hey many students face this problem!!!

u shld startwith ncert first and then move to books like r.d.sharma

if u r preparing for entance test then try m.l.khanna and arihant

i know it is too much but since the weightage f this chapter in iit and competitions is quite much so it is generous to give time to this chapter

 

also u should first  read geometry(euclidean & co ordinate both) which help in this chapter a lot.......

 

remember practice makes a man perfect