i got 13,459 rank in srmeee.. I feel depressed. i m getting approx 150 marks in aieee. how can i get so low rank in srm?

It is a matter of examination temperment. Do not feel depressed. There were even instances of people failing their 12 board and yet have qualified IIT JEE. It is quite possible that you did not take this exam as seriously as you did for AIEEE.