CBSE 12th

You can actually do. But the problem is correspondence certificate has no value. Try for other college with your 1st PU marks card and TC. You might get some help don't take up correspondence. Sometimes degree Colleges will not accept those certificates.

I think you should go for B.Sc because you have 2 years of gap and the syllabus of B.Tech is li'l bit vast than B.Sc.
You can get many Government and Private Jobs after doing B.Sc.
Just take the right branch in which you are better than others.

Advanced Diploma in Pre-Production and Game Design
Advanced Diploma in VFX
Aircraft Maintenance Engineering
B.E (Mechanical Engineering)
B.Sc. (Biotechnology)
B.Sc. Applied Physical Science
B.Sc. Life Sciences.
B.Tech (Aerospace Engineering)
B.Tech (Mechanical & Automation Engg.)
BAMS
B.Arch
Environmental Studies (KRVIA),
BCA (Bachelor in Computer Applications)

Advanced Diploma in Pre-Production and Game Design
Advanced Diploma in VFX
Aircraft Maintenance Engineering
B. E. (Mechanical Engineering)
B. Sc. (Biotechnology)
B. Sc. Applied Physical Science
B. Sc. Life Sciences
B. Tech (Aerospace Engineering)
B. Tech (Mechanical & Automation Engg.)
B.A.M.S.
B.Arch
Environmental Studies (KRVIA),
B.C.A (Bachelor in Computer Applications).

Hi Ramanan,
You can apply at University of Petroleum and Energy Studies.
http://www.upes.ac.in/upes_btech/index.php
UPES is the first Indian institution to offer 85 specialized programs across various domains like Energy, Infrastructure, Transportation and Computer Science & Engineering.
Situated amidst the lush greens and mountains of Dehradun UPES has a beautiful campus, wherein students can study in peaceful surroundings.
Apart from that UPES is considered best for its above 30 specialized B.Tech programmes and placements.

Hi Manish,
Yes, you are eligible. The eligibility criteria is-
Science stream students (both Mathematics and Biology groups- PCM/B), who have passed 12th standard board examination from a recognized board are eligible to pursue this course.
All the best.

Hi Nitya, where do you plan to study?

Hi,
Highly academic graduates from renowned institutes such as IIT, BIT, Delhi University (LSR, Miranda House, St.Stepen's etc) are sought after. Having said that if you don't have the skills then only the degree won't help you get into these top ranked schools in the world.

You can opt for JEE Mains paper 2 which is for admission into B.Arch and can also apply for NATA examination, for both the exams you need to have physics, chemistry and maths as the compulsory subjects.

Hi Ruchi,
Any course which you want to pursue also depends on your interest and where do you finally want to land up. As per you marks, all the fields such as arts, commerce and science are open.