Hi Uday,

There are many good engineering colleges in Mumbai after diploma.  Ratings of the colleges depends on the facilties, campus, extra curricular activites and what other exposure one can get from the college. Here are few best colleges in Mumbai :

1. VJTI, Mumbai

2. COEP, Pune

3. KJSCE, Mumbai

4. PICT, Pune

5. DJS, Mumbai

Good Wishes, All The Best.