Hello,

jee mains  is a national level entrance exam for engineering aspirants and eamcet is state level.  Top engineering college covers all IIT campus,NIT campus and IIIT campus and for private college BITS campus.

for that you can't use eamcet marks. They accept only JEE main only. BITs may accept the state exam where it is situated.

so you have to plan where you want to go. if you get a rank below 2-3k then you can get an admission in NIT and lower colleges. for IIT you have to clear JEE advance.

But don't worry about all those for now. just give your best  and get your score rank and results then you will decide where to go based on them.

Hope it helps!