Short to get compulsory university’s equipment

I saved up to get myself at least a functional tablet for university, Im doing Foundation in Sciences. I always get severe knee pain from walking too much or even standing for a long time. The material for my studies are super heavy and my legs can't cope the pressure it was put on. I was adviced by my supervisors on multiple jobs to quit because I can't stand the long hours, that's why I can't save enough. Your kindness today will be forever remembered cause I'm fighting to change my fate. Thank you.