As a Engineering student you can do the following things to excel in interview/ written test for any job:
Publish a few papers with the help of your professors.
Learn few softwares esp. Ansys, Fluent, Pro-E, Auto-Cad, Solid Works
Be thorough with your basics and appear for GATE, targeting 99 percentile or a rank in top 100.
Appear in CAT/XAT/MAT for MBA/PGDBM
Learn Coding : C, C++, Java, MATLAB etc
Try to be a class/university topper with 9+ CGPA.
Learn Web designing
Improve presentation and communication skill.
Do a good final year project
Improve your hold on English language.
Believe in Almighty and try your best
All the very best in your endeavour.