Hello , 

As your query is you want to know whether your SC caste certificate is valid for long-term education or not. Here I would like to tell you that the caste certificate in India for backward or minority classes is valid for 2 to 3 years based on the category to which they belong therefore after 2-3 year you have to renew your caste certificate, if at the time of re admission in a new year or in any other entrance exam or counselling process you might need it, so it's better to keep your SC caste certificate upto date.

Further, if you have any other query regarding this you can let me know in the comment section below I will definitely help you with that.

I hope your query is solved.

Thank you.