Okay, I am also from the U.S and recently completed high school. I applied this year and also plan on returning to the states to do residency, so I can give you some insight into the process.
Your SAT I is pretty good and should score you an interview with Aga Khan, but keep in mind Aga Khan is literally (as far as I know) the only Pakistani medical college that asks for the SAT I score. Instead, they will ask for SAT II Bio, Chemistry and Physics (or Math). Your Bio sat score is good too. If you want to guarantee a higher score than take the SAT II Math I exam instead of Physics, since they accept either and Physics is a pain.
You ask what college is good for your stats? All of them are doable, if you have all the requirements like IBCC equivalency which ALL colleges require and SAT II scores.
The best college for IMGs is the best medical college in Pakistan -- Aga khan. But, in the end you have to self-study in every medical college so it doesn't matter as much whether you're in Shifa or DIMC. I have a bunch of relatives who went to less known colleges but had
good USMLE Score and are now practicing in the U.S. One of my cousins recently graduated and is now giving his interviews for residency.
But, being an IMG is not easy if you want to get into competitive specialties in the U.S like Dermatology your chances are extremely slim (people are doing it but its difficult). Also Pakistan is a different world than the States and some people don't want to deal with it. It's your choice in the end. I'm not trying to discourage you, just telling he reality.
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How do I obtain my IBCC equivalence marks and by when should I obtain them.
I am pretty sure Aga Khan and DIMC don't want IBCC equivalence marks, maybe Shifa perhaps.
Check the IBCC website for requirements:
http://www.ibcc.edu.pk/
They all require IBCC equivalency. They have to be able to compare you with their system, so they need equivalent scores. You have to check the requirements on the IBCC website then go to Islamabad where there office is and give them the required documents (they ask for a lot of things).
You have time before the next years applications open - the current application year is still going on actually. Get it before May since thats when AKU's apps open.