You're eligible for B.A Political Science at DU but not by choosing ONLY science subjects in CUET.

Here's what you should do:

For CUET there are upto 5 subjects you can choose

1. Language (Mandatory)

2.Two domain- relevant subjects such as political science+ history/sociology/geography (Mandatory)

3.Remaining two subjects are totally optional they can be:The General test(GK,Logical Reasoning etc)and any other subject even from science domain but it won't help with the eligbility for BA.Political Science

Remember:Only your Language and Two arts subjects count for eligibility