Hello,

As per RBI Assistant eligibility criteria, candidates must be a graduate in any discipline with 50% can apply for the exam. Candidates who have not completed bachelors degree are not eligible to apply. Complete your b.tech first then apply. The age limit prescribed for the recruitment exam is 20 to 28 years. 

Thank you!!!

Dear Khan
Before completing engineering only you need to take the test,  because as they mentioned correctly that if your educational qualification is graduate or more than that, UI of are not eligible.
I checked twice.  Please click on the below link,  it's from the RBI website only..
RBI
All the best.

You cannot because it requires you to have bachelor's degree for more details please read this article:

https://gradeup.co/rbi-assistant-age-limit-eligibility-criteria-i-55307660-5fdd-11e7-af8c-37acfdaf3a8f

Hope it helps