Serious question, will I go to jail for downloading music off of Mediafire through a school-issued laptop?

Long story short, my Dad was taking online classes and was given a laptop. The company said he can keep it and we can do whatever with it. So I downloaded music off of Mediafire. I swear to GOD I didn't know it was illegal. The laptop had blocks for illegal sites like limewire so I thought Mediafire was okay. I downloaded maybe...350 songs? Well it turns out my Dad has to give the laptop back because he didn't finish the program. They said if we have anything saved we can send a flash drive and they'll transfer everything there onto it and send it back OR they can swipe it clean. I'm bugging out right now. My Dad doesn't know about the music and I'm freaking out. I really didn't know it was illegal, my friends told me it was safe and I even read online it was safe. I'm shaking so badly. I really didn't know it was illegal :( If they swipe it clean do you think that they will look at our files and stuff..?