HI Shubham!

First of all stay calm and focused on what you want to do. Its totally fine if you took a drop for prepartion atleast you won't regret taking it if you haven't. 

Coming back to your query, there are dual degree courses running in our country and students do qualify even if they don't have maths in their +2. And you're a great student , as it is not possible for everyone to score 90% in their boards!. 

1)IPM IIM INDORE- this is a dual degree course offering BA+MBA at IIM INDORE. I'm a student studying the same course and the demand of the course has increased since last two years. The forms are floated around mid march. And there is any aptitutde part and a very nominal amount of maths is asked from class 11 and 12. The ask basic mental ability and maths from class 10 .

2)NIRMA offers the same thing as IPM . 

3) DU JAT. 

4) CLAT. 

hope this answers your query, all the best

cheers!