Need helpin vlookup function

This looks a lot as if you are asking us to do your homework for you. Such questions are not welcome here.

Hi Rahul

If your Student table is in A1:C8, and the Score table in E1:F5, your formula in C2 would be 

=VLOOKUP(B2,$E$2:$F$5,2,1). Note that the last parameter is equal to 1. It is an approximate match, which is essential for the formula to work in your case. 

Yury