Hello

Since you completed your 12th in the vocational stream, and Chemistry was not included by your school, this is understandable.
As long as you studied Maths and Physics as compulsory subjects, you may still be eligible for many science or technical programs, depending on their specific requirements. However, some courses (especially in medical or pure sciences) do require Chemistry, so it’s best to check the eligibility criteria of the institution or exam you're applying for.
If needed, you can request your school to issue a letter confirming your subject combination.