I usually create a word document containing all of the features of the novel or play that you are studying, throughout the reading of the play i jot down notes and them compile them into one big document. I usually include things like; Characterisation, Symbols and motifs and quotes. I find it to be really helpful resource when you get to the practise essay writing stage as you eventually have a huge stockpile of notes that you can extract from and formulate really well written essays. Also the notes are from you and by you, so it reinforces your memory of certain events and quotes.
GL!!