HI BALARAM!

being a maths student, there a numerous exams in which you can apply!. Ranging the very common and basic engineering entrance exams to B.Comm or BBA. 

The forms start to float from the december month itself, and since jee mains is now been conducted twice a year, the first form is floated around September. 

Apart from this is you are interested in doing management in a keen age then IPM IIM INDORE IS THE BEST OPTION . Along with it NIRMA offers the same dual degree course. 

hope this answers your query, all the best

cheers!