Ppf withdrawl

I have withdrawn 7-lacs from my ppf for payment of  higher education of my son in medical.

But he did not get admission in desired stream & branch. Now at-least for 1-year , this money will not be nneded.

and after 1-year it is not sure will it be 7-lacs or more or less.

what options do i have to invest this for 1-year & save tax also.