mr singh, if the rear wiper 'oversweeps' then the arm needs repositioning.
Flip up the spindle cover at the motor end of the wiper, remove the
locking nut, then carefully slid the wiper arm up and off the splines.
Place the arm partially back on...and positioned the arm/blade level
(horizontal), then push it down the splines, replace and tighten the nut,
and finally flip the spindle cover back into place.
Test to ensure all's well.
As for your rear seat not lifting.....
The seat base will not unlatch unless the seat is slid all the way forward.