Hii I have completed my BSc in mathematics and then did a PG Diploma in CG and now I am willing to a

Hii I have completed my BSc in mathematics and then did a PG Diploma in CG and now I am willing to apply to public university in Germany and I want to apply in finance and mathematics. Am I eligible for the same. Also the consultants are providing me with the options only related to mathematics and I am little confused.