How old are you my friend? Bigger bikes operate almost in the same way as do small bikes, except for gear shifts and of course the control factor. By "TRAINING" I think you want to learn knee dragging since you are talking about riding it on track. I have never heard of any racing track in Pakistan, and on common roads even the basic thought of speed cornering is next to committing suicide, watch for the pit holes, a broken down rickshaw on the side and stuff like that.
Long story short, if you are really interested in this stuff, apply for foreign visa.