Hey Ravi

California Institute of Technology (CALTECH) does not consider GRE scores only but judges an undergraduate student on overall performance for admission into Masters. There have been various situations where in student's got admission with an average GRE score but had an excellent academic and extra curricular activities. You need to have the following to increase your chances of selection:

• Good Statement of purpose (SOP)
• Extra Curricular Activities
• Good Academic record with accomplishments

To be on a safer side one should score 320+ in GRE, and be in the top 90th percentile.

For further doubts, ask us.