Hi Abdul,

After doing B.Tech in mechanical engineering anyone can do M.Sc.in mathematics. If you want to do a M.Sc. in mathematics then in B.Tech you should improve your maths with solving numerous number of questions and problems. There are many exams for MSc in mathematics and some of are as ISI, CMI, TIFR etc.. through which you can join MSc course.

I hope your question has been answered properly.

All the best for your future!