yaar dont stay at unknown low level places in lahore. you will get in trouble for no reason at all.
If you cant afford pc, avari or holiday inn.
I would suggest best western hotel in liberty market or regency hotel on mall road next to BNU ( beacon house national university).
Regency charges 2000-3000rs maximum for 1 night.
Best western charges 3000-3500rs for 1 night.
Try to haggle with regency hotel. they will give you some discount. But with best western , its hard to get a discount. But still try.
My honest advice dont stay anywhere else. All other cheap places in lahore are involved in illegal activities and you might get in trouble for no reason.
Both these hotels upmarket family hotels. So the atmosphere is nice and safe.
Good luck with your SAT's
And regency hotel is far nearer to your sat's test location which is (holiday inn).
Best wesern is not too far either and they provide free pick and drop service and sometimes they might charge you aswell.