hi,

see transfer certificate or school leaving certificate is issued once you passed your 12th course , however if you did not receive it, you may apply for it to the head of the institute. you have to mention the year of passing 12th and may need to attach the pass certificate. so contact with school officials  or exam section.

TC is some times mandatory   to take admission in the colleges depends on the college norms and admission policy.

hope you get my point.