Prepayment of home loan

I have taken loan from bank rs.10 Lacs @ 10.5% interest for 240 months tenure since last 12 emis had been already paid.

now i want to make prepayment of loan Rs.1 Lac upto 4 year along with monthly emi to make it outstanding loan balance rs.6 lac

my question is that whether over all intesest payable through out the tenure will be reduced to much extent or it will no impact on total interest payable.

pl. some one suggest if any better option to complete loan outstanding as earlier.