I never studied ‘resistant materials’ as a subject in School.
But I can tell you what worked for me. I think using diagrams to remember ‘how things work’, is quite a useful technique. Diagram helps you to understand things (rather than merely memorising it).
Also, if you have to remember long list of properties, names etc. try using mnemonic (a formula that helps one remember something). Example: ROY G. BIV. R=red, O=orange, Y=yellow, G=green, B=blue, I = indigo, and V=violet.
I remember the mnemonic for the colour spectrum we used was Richard Of York Gave Battle In Vain. Often remembering little rhymes and phrases help you remember things, for example SOHCAHTOA is permanently ingrained in my mind for remembering the method of calculating angles and lengths of right angled triangles, and Queen Victoria’s Cat for Q=VC.
As Amit says, creating diagrams so you can picture things in your mind is very helpful so you can recall them during an exam, also using different colour pens helps a lot when you are creating your notes.
I found by far the best thing you can do in any subject is to get youe hands on as many past-papers as possible so you can see what the questions were like in previous years. Try to do them without looking at the answers first to see what areas you need to concentrate on. If there is an area you are really good at, it’s probably not worth revising that too much.