Top 100-150 rank students generally don't come as many of them have already cleared JEE.

And after that the seats in AEC gets filled up in this order & the no. Of  seats provided in the bracket -

1. Mechanical (60)

2. Civil (90)

3. Cs (20)

4. Electrical (90)

5. Electronics (60)

6. Chemical (60)

7. Industrial production  (20)

8. Instrumentation  (20)

Hope this helps..

Best wishes...