In order to opt for CSE you need to be eligible on the terms - B.E./B .Tech./AMIE in any branch of Engineering/Tech. (or) Equivalent Masters Degree in Physics, Statistics, Mathematics or Applied Mathematics, Applied Statistics, Applied Physics, Geophysics, M.Sc. (Co mp. Sc.), M.Sc. (Information Systems), (Computer Applications and Electronics) and MCA (or) Equivalent. Since, you are graduated in Btech mechanical engineering so you can surely opt for CSE.