Which is the best course among these?

As your interest you can Chose.

As If you wants to became An IAS or IPS you can Do BA and work hard to prepare for UPSC exam

Okk... Thnx.... Nd what about designing?

Designing is pretty good and Very much scope .
You should have good design ideas.

The only thing is that I'm not interested in PCM.... And m confused what to do next

As you don't like one of your PCM, then just two fields are left. Computer science & biology. But computer science courses contains maths & electronics & biology contains chemistry.. So as you have not in PCM, so I think those would not be beneficial for you.

Then you have left BA & BCOM..

If you have interest in the field of business, then you can opt BBA or travel & tourism etc etc.

Now you choice, where you want to go. Then I can help you better..