Which is best among msc(electronics) , mca , msc(cs) after completing Bsc(maths, computer scince, physics) ?

First u setup the target of ur job. In which line u wanted to do the job. If u want to go for the teaching line then go for any post graduation according to ur liking of ur subject. Every line is good and having lots of opportunities. If u want to go for technical line then Getting Degree is not eno

Madhuri, As your ultimate goal is to do M.Tech in prospective vlsi/embedded systems -undoubtedly M. sc. Electronics will be better option for you for which you may have to appear and clear the admission test of the University, depending upon it's mode of selection. Best wishes....