raise the humidity of your cage, if your snake is having a bad shed ie "skin did all come off and some has gotten stuck" check you humidity gauge and make sure your humidity is right, you can prove a moss hide you keep damp,not wet, if your snake has a bad shed which will happen from time to time, i just take my snake put it in a container with some warm water and air holes and leave it in their untill the skin that was stuck is all water logged and then i help gently pull it off

if your tank is consistanlty at the right humid level you snake should have a good shed almost all the time.