Engineering Scope

Just take Automotive Course in B.Tech. By the time you complete the course, you will come to know how to proceed further.

As of now, Chemical Engineering doesn't have much scope. You might get employed with less package. The best way to excel is to go with Masters and Ph.D.

Science has the best scope now and if you pursue engineering after your PUC in Science then you will have better scope.

You can go for automobile, aeronautical engineering, CSE, etc. These courses are suitable for average students.
All the best.

The best way to predict a college through JEE Mains score is using shiksha college predictor. After that, just go for the counselling of that college. You may also choose a private college like BITS-Pilani, SRM, VIT, SKIT-Jaipur, Galgotias, Sharda University, LPU and NIRMA.

Check out the links below for all the details :
https://www.shiksha.com/college/iim-Ahmedabad-indian-institute-of-management-iima-vastrapur-307/admission#admission
https://www.shiksha.com/college/iim-Bangalore-indian-institute-of-management-iimb-bannerghatta-road-318/admission#admission.

Technician as knowledge is important for technical terms and have knowledge can do management better.

Well, the scope of mechanical engineering is comparatively low now but if you get a good college you will probably have a good chance to do something better in your field.