The best way to learn and remember music theory is to write it down. E.g. all the scales you should write on the paper.
If you have no notebook, there is a great website, that allows you to print blank sheet music.
Also, if you are a composer, or a music arranger, then you can use print blank sheet music to print customized blank sheet music according to your needs.
You can adjust a clef, time signature, key signature and lots of other things, so try it.