Dear Sofiya, once your brother completes his 3 year Polytechnic diploma or its equivalent course, he can study AMIE. It is an B.Tech Level course recognised by all State Governments and can be done through Correspondence. That way he can work with his Diploma degree and also upgrade his Academic qualifications. Mechanical Engineering is a branch available in AMIE. Those Candidates who pass from AMIE get equal opportunities like the candidates who completed their BE/B.Tech the traditional manner. For more information on AMIE, please visit their official website at: https://www.amieindia.in/what-is-amie.php