Hello, i need some guidance please🙏🏿🙏🏿

I will be joining college this year and i am taking economics as my major.

I was preparing for neet and wont get thru this year so now i am thinking of doing a switch and i want to prepare for rbi grade b exam ( i am very passionate about it)

Although i know the surface info but i really want to go deep into it before i really pursue it

I want to prepare side by side my college years but idk what to do and where from.

So please please help this fella out