What is the required educational qualification to become a maths lecturer?

You should complete your Masters and then apply for the NET exam.

Hello, The minimum education qualification required to become a lecturer in Masters degree. If you have pursued the postgraduation in Math then you are eligible to appear in the exams conducted by the National Testing Agency for selecting the candidates for the post of Assistant Professor (lecture

There is no such different qualifications that you need to know to get a doctorate degree in Maths. Like all other subjects, Maths is also the same and for getting a doctorate degree in it, the procedure is same.