Hi,

See there is no age limit to apply for neet ug, candidates must complete the 12th course with physics, chemistry , biology and English as a mandatory subject . marks criteria for general category candidates is 50% in PCB in aggregate. For reserve category applicants of sc/ st/ obc candidates need to secure 40% score in PCB in aggregate. Since there is no age limit you may apply as dropper candidate for neet ug.

Now coming to tc , it depends on colleges norms and regulations. Mostly school leaving certificate or tc is required. However at that time you may show the xerox copy or describe the reason for not having the original copy. If you could manage a duplicate copy from school that would also work.