There are two types of scholarships
Merit scholarship : This is basically for everyone. To awail this you need high cg. Only 1% gets 80% scholarship and 2% gets 40%.
Merit cum need : You can apply for this if your parents(father+mother) income is below ~8 lakhs. This is easier to get that the above one.
You get 80% at ~8.2 cg
40% at ~7.0 cg
25% at ~6.2 cg