Hello irfan,
If you are doing to mechanical engineering then you have to join AUTO CAD, SOLID WORK, PRO E etc which is necessary for designing.
You can join GATE coaching also in last year. If you are good then join. There are very option after get 75+ marks in GATE.
Good luck.

Hello irfan,
Piping design and engineering course ,tool designing course ,robotics course ,mechatronics course are the best courses you can prefer after your b.e mechanical .
Good luck