well since you are coming back from pakistan you will have two options to choose from:

1- opt for a seat on the foreign students quota

2- opt fro a seat in the regular stream

most of the private and public sector universities offer the foreign students quota. some of them make it necessary for them to take SAT-I or SAT-II (whichever’s applicable)

the foreign quota has a higher admission fee (usually in US Dollars) that usually follows fees at par with other students (in PK Rupees).

the problem however is that there are no universities in pakistan that has a standard close to any of the american counterparts.. although you can get excellent levels of education and all but worldwide recognition of your degree would be something you’d be missing.

the entry test? yes you’d be able to manage that if you have a good academic record!