how i can be an xpert in this?????????/

If you meant TRIGONOMETRY as tri and want to be able to do every single type of question then i think you could solve

S.L.Loney's PLANE TRIGONOMETRY part I and part II .

these books give a very good base and also deal with high order thinking questions and of course Practice makes Perfect.

So the more u practice the more expertise u achieve !

Best Of Luck