I will complete my B.Tech civil engineering by 2018. What should I do to get admission in a good college of MBA?

If you want to start your MBA immediately in 2018, you should start preparing for the entrance exams accepted by various colleges. Some of the exams are CAT, XAT, IIFT, NMAT, SNAP, MAT, CMAT, ATMA, ICFIA. https://www.shiksha.com/mba/articles/20-mba-entrance-exams-you-can-take-this-year-blogId-11473