I am doing construction job & want to do construction management. I am MBA in marketing

Visit the link of MBA in construction management courses of RICSSBE to get a clearer picture of courses and career scope after it https://www.shiksha.com/college/rics-school-of-built-enviornment-noida-36312/course-mba-in-construction-project-management-167919.

You may opt for part time courses in construction business which will help you to land good job prospeects and also to diversify. You can pursue Certificate Course in Project Management from SAMVIT School Of Infrastructure Business, Pune on part time basis

If you are planning for Sales/ Marketing in Construction Industry, then your MBA is enough. Try out in those sector.