[section 80e] deduction on interest incurred in previous years

Hi,

I have education taken education loan. There was no emi while i was studying. By the time I started paying my emi the principal amount was ~5lacs and total interest incurred in all years was ~1.3 lacs.

I repayed almost entire amount during first year of repayment. I.e FY 17-18. now can I apply for tax deductions for interest incurred only in FY 17-18 or all the interest incurred in previous years as well?