Hey,
Your question is slightly vague. See,for Masters of Technology(M.Tech),the minimum eligibility criteria is to have a Bachelors of Technology(B.Tech) in the relevant stream. So,the marks of class 12th should not be any source of worry for you now. As you have already met the eligibility criteria before pursuing your B.Tech.
The minimum eligibility criteria to pursue M.Tech in Artificial intelligence and Machine learning is to have B.Tech or B.E degree with 50 percent marks. You need to clear entrance tests like GATE to study this.
Hope this helps you.
Good luck.