If you are interested in continuing your career in computer science then the best option is doing degree in computer science. The eligibility criteria of BSC computer Science is candidates must have passed there with compulsory subjects physics chemistry and mathematics with 50% of marks. Admission processors are based on merit and entrance exams. If you are total percentage is 42 then it will be difficult for you to get admission in colleges on the basis of merit

But for entrance exams you just have to perform well. Your percentage in 12th doesn't affect the entrance exam results. If you wrote the entrance exam soil you will be admitted to best universities or colleges on the basis of rank list published.

Here is some of the careers you can pursue after doing degree in computer science

IT consultant.

Information systems manager.

Database administrator.

Multimedia programmer.

Systems analyst.

Games developer.

Technical writer

Artificial intelligence and machine learning engineer.

Business analyst.

Chief information security officer.

Cloud computing engineer.

Computer science professor.

Computer scientist or computer science researcher.

Data scientist.

Database administrator.

pay is competitive, and job growth for the industry is faster than the national average. 4 more details about computer science you can refer the article given below

https://www.careers360.com/courses/computer-science-course