Hello Buddy! Hope you're doing good.

Yes It is possible to join B. Tech course after completing B.Sc through the lateral entry scheme which is offered by most of the Engineering collges in India. The lateral entry is only given to candidates who have either completed diploma in Engineering or B.Sc course.

But tech course in mechanical engineer after b.sc., there's no point in doing B.Tech. after Bsc. Either you go for Msc or you take up Btech first and then go for Mtech in Mechanical engineering. Hope this will help you.

ALL THE BEST! WORK HARD !!