CBSE 10th

First of all, it is very important to plan your studies with a clear objective: Have a plan to show what is the current percentage of marks and what is the aim, what subjects are your strength and what are the weak points; go for a weekly timetable; allocate optimum time for strong subjects and more time for weaker ones; make sure to have enough time for food, rest and some relaxation or play. Have mentor in the form of teacher, parents, sibling etc. It truly helps to have someone guide you, direct you, review your work. Consistent and planned efforts will surely fetch good marks. Take up a lot of mock tests and get them corrected to know where you stand and how you handle pressure too.

Hello Ajish,
The information you have given is quite interesting. You have scored quite well in your 10th, your 12th and even in your MBA. But while doing BE, something has happened which made you not score well. Oh. After you have finished MBA now you want to do Masters in mechanical engineering? Is that right? Yes, you can of course do it because you have scored more than 50%. You need to appear for GATE and depending on the marks obtained in GATE you can get an engineering college.
Normally speaking, your marks in BE should not matter much as compared with what you will get in GATE 2019, but which college and which university you will get depends to a large extent on how those scored better than you give their choice. So I suggest you should not think over it and just concentrate on clearing GATE2019, with very good marks to get admission in your desired college.