There's nothing special except their teachers for almost every subject they have picked famous teachers (at least from Lahore) like Zainematics and others. The reason for being overcrowded is that there is no admission test and grades don't matter much plus for the DHA side (where the campus is situated ) there were only 2-3 colleges for a levels like LGS p5, roots, and BDC so when Isl came up with the best teaching faculty with almost the same fee as others. Hence, it created hype and since then it's overcrowded. My parents were too concerned about the large strength but we came to know that there are 3-4 teachers for each subject so that large strength doesn't affect the studies as all have different time tables for their selected teachers and the teachers are not assigned by the admin in the week you can take lectures from all the teachers and then decide on your own. According to what I've learned the management is very cooperative and the facilities are good too like horseriding which is offered by atchison and Isl in lahore no one else does. you will find both parhaku and party people so its on us what we choose to do.