When we get this information from the official website, the qualifications for TGT maths are divided into three categories -
Qualification - Graduation degree in a related subject, as you mentioned you are graduate from maths subject then you fulfill this qualification.
Essential Training Qualification - B.Ed is also an equivalent qualification, ie either you have a B.Ed D.Ed or any other related course which is related to teacher training and has equal value.
Preliminary Qualification - B.Ed, Ph.D. degree or certificate related to performance in any national-level or state-level sports competition.
So in this way, to give the TGT exam, the candidate should have Bachelor's Degree (Graduate) and it is mandatory to have a teaching certificate like B.ED, M.ED or BTC, or any other teacher certificate.