CBSE 10th

Intermediate or 10+2 is possible only after passing the 11th standard. Hence inter in single sitting is little bit confusing. You can pursue the degree courses from IGNOU or other open universities on the basis of 10th class also but subjected to passing the BPP first. However, you will face the problems in higher studies because Universities asked about the completion of formal education means 10+2+3/4. However, yours degree will be valid for government jobs only.

Kindly confirm your 12th marks. Did you have physics, chemistry and mathematics?

There were thousands of students who gave the PET. You have scored really very good.
Good luck.

Yes, u can get a good college in 78%

It depends on company criteria as topmost company most of the time do the filtration while campus recruitment i. e. eligibility criteria above 60% overall, till graduation. But it's all about your skills and qualities you possess. If you have all those skills and knowledge that they want then obviously they will select you.

No, I don't think so. You can only do it after passing class 12th.

Graduation is possible without the formal study of 10+2 from distance learning mode like from IGNOU subjected to passing the BPP exam. Bu, for LLB you needs to complete class 12th also. So, you cannot study the LLB without passing class 12th exam.

Fees varies from college to college, please specify the college, so that I can help you.