Hey aman! 

It's okay if you don't have maths in your class 12. 

The commerce feild particularly bcom, bba offer maths in their 1st semester or 2nd semester and it's okay if you've lost your touch they start from the basic for different lessons. 

So don't worry it's also going to be easy. 

But if you want to join a career with a science background then maths in your class 12 is a mandatory subject. 

All the best.