Hello Aspirant,

See if you appear for GATE examination in your third year and qualify it with good score then you can take admission to NITs/IITs or can go for PSUs as well, only after completing your final year but yes if you qualified it in third year then there is no need to appear for it again in final year. Because admission will be on the basis of the GATE score secured by you in third year and you just have to participate in CCMT or COAP counselling for admission to IITs and NITs respectively and can apply for PSUs.

For complete details about GATE Counselling kindly check out the link given below :-

https://engineering.careers360.com/articles/gate-counselling

I hope this information helps you.

Good Luck!!