hey there showman. welcome to the forum.
I would definitely suggest taking the SATs over the entrance test as well. The testing system is a little different in Pakistan in that they place a large emphasis on memorization. I took the entrance test and found it to be rather difficult. If you plan on taking the entrance test you absolutely must study(well unless you are genius type) from the local FSC books. Read the thread
Any1 going to apply for MBBS this year (2007)? for some more info about entrance tests.
In my opinion, taking the SAT IIs has a lot of advantages...
1. If you take the tests now and score well you won't have to fly out to Pakistan just for the entrance test. Which is great if you're already enrolled in school at home.
2. If you don't score well on the SAT IIs you can take them again! (Although I don't think they would like to see the same test taken 5 or 6 times...)The entrance test is a one shot deal.
3. The SAT testing style is much more familiar than Pakistan tests.
4. You wouldn't have to read the FSC books!
Try taking the SAT IIs first and seeing how well you do on them. If you think your scores are too low then use the entrance test as a last resort!