How much marks do general people need to get into a good college?

First of all, marks for different streams vary upto a great extent. In some colleges, for Bachelor of Science programs, say a cut-off in 496/500 which depends on the respective college as to what their calculation index is. For medical, the cut-off for government medical collegesis around 500/720 which depends on the NEET test conducted every year. So, in order to get a satisfactory answer to your question, we would suggest you to mention the subject of your interest so that we can tell you about the colleges pertaining to that subject.