Lets be straight, due to the paki behavior on bribing, you'll find thats the reason why they are so strict over here and dont trust ANYONE, which is why the IBCC wants to see all your ORIGINAL documents in person, and usually sealed, and than they will again request your documents direct from your educational institution, so I dont see where and how you can bribe someone unless you do it from USA!!! Plus the HEC would like to see your original documents and as well as your Medical college and even if you DID bribe someone along the way, you would be caught eventually, even at the end of your 5 years or even AFTER graduation they would cancel your degree or whatever, so dont see how this is possible.
Bribing for admission? Well its almost impossible and very unlikely, might have happend a few times but these people paid a LOT of money and they were caught!! Admissio is totally based on Merit in Pakistan, and people go to court all the time to fight for seats, trust me there is no bribing dont know who told you that!!!
And bribing to change your grades???? What grades!!! There are no grades in Pakistan medical school. Only thing that basically REALLY matters is your professional exam at the end of each year and its a pretty tight system lately, anonymous checking etc by multiple people who dont even know whos paper they are grading, so who are you going to bribe, all of them who dont even know which test is yours???? Plus they are starting to institute cameras and hefty punishments and jail time for people manipulating this system in anyway (no joke)
Trust me.. Something you can get away with bribing here for is something that isnt important and is stupid in the first place (like bribing some attendant to fix your attendance, which is irrelevant because its gay to HAVE to come to class in the first place and in the end everyone makes it through anyway) so no one cares about that anyway.
So get that bribing mentality out of your head, I have yet to find someone you can bribe even if you wanted to and for what!!