Hey Harshita

Here in India BA LLB is actually a 5 year integrated course but to do LLB of three years you need a bachelor's degree in your hand. For DU LLB exam you must have a bachelor’s degree with at least 50% marks. So without a completion of degree in any undergraduate course you cam not look for DU . 

But there are other plenty options to get into the BA LLB course

• To get into national law university , Delhi go for AILET
• To get into a national law school go for CLAT

So it is recommended to you to either go for CLAT or complete your graduation first from a prestigious college or university and then start preparing for DU LLB entrance.

Good luck!