So in my case there were too many students so they just collected all our passports and gave us the permits. I read it and went to another immigration guy I came across. At first he said that the permit is for 1 year because my visa is for 1 year. I told him that my visa was valid of 4 years, then he asked me which officer gave me the permit. I didn't know the name. He told me to follow me to his counter. Then at the counter he told me that they did that just to make sure everything is still smooth after a semester or two. He just told me to extend it a few months before it's expiry. I didn't request him any further because I wasn't sure if it's gonna make a difference.