CBSE 12th

No, you are not eligible for B.Tech civil engineering through distance because you have commerce background.

10 Best Course options after 12th Non-medical Students
1. Engineering (B.Tech)
2. Bachelor of Architecture (B.Arch)
3. Bachelor of Science (B.Sc)
4. Bachelor of Business Administration (BBA)
5. Bachelor of Computer Applications (BCA)
6. Bachelor of Mass Communication
7. Bachelor of Hotel Management
8. Bachelor of Education
9. B.A. LLB
10. Bachelor of Financial Markets.

Previous year certificates can be found on the CBSE Academic Repository online. You just have to fill in the details.

Yes, you can take admission in MSU broda in B.Com but their main preference is commerce students, but you can take admission in that because all streams are allowed to do B.Com course.

You can apply as a private student through any CBSE school. Firstly visit the CBSE website. There you can find all the detail and in external website also. One can appear as a private student in CBSE. Candidates who fall under the Fail or Compartment category and those who prefer to appear for the exams as private candidates in order to improve their performance or to take an additional subject may fill in this CBSE private form. The form and instructions can be downloaded from the website.

You can get admission in BCA although you are a commerce student because it doesn't specific that you need to be a science student.

As per CBSE rules, if you obtain supplementary in any of the 2 subjects then you are not eligible to get promoted for the next session. You have to repeat the class 12th one more time.

Yes, he can change his school but he needs to study 12th again in other school as well.

You will be considered as a fail. Even though you got out of out in 3 subjects if you fail in 2 it's considered as a fail. Rather than worrying about passing and failing just believe in yourself and give exam you will surely pass. Hope this answer helps you.