IF line conditions are good than no better than PTCL. If line conditions are bit bad go for Link Dot Net. I have experienced both.
PTCL will give you constant speed nearest to the advertised speed. By the way link dot net has the easiest method to get a student account. Just show them a Student ID Card and you will have 30% discount.
and If you line conditions are worst then go for some wireless solution. You can have Wi tribe, PTCL Wireless. Sorry If there were spelling mistakes. I wrote this a hurry Link dot net fluctuatees in speeds although there service is better on bad lines, may they have better equipment.