When I studied a module, I'd go over the syllabus (and prescription which lists the books and mentions some other facts not in the syllabus that I saw in the CSSA trial so I just popped them in too) and I'd make sure I understood every word and the main points asked for. Look at the outcomes too. Then it's important to read the text. If you know the text intimately, you can't get stumped. Then, you may want to read over it again, but this time note key scenes and quotes. For example, in (let's say) Hamlet, it's important to understand context (social, cultural, historical - reformation, Elizabethan England, Christian etc.) and how they are reflect in the text (religion important, superstitious, ghosts, military references), values and attitudes apparent through a range of readings (e.g. traditional/liberal humanist, feminist etc. - women are treated badly by male characters "frailty thy name is woman"), language features, purpose (entertain and inform etc.) and audience of text (diverse, from peasants "groundlings" to high society - that's why there are silly elements like fighting, sexual innuendos etc. as well as important consideration about themes like death). Also look at the outcomes. Know about character, plot, theme etc. too. Do the same for your other text you are comparing it too, which in this case would be R and G are Dead. You would talk about change in context (existentialist, nihilistic etc. post WWII, Vietnam War) is reflected in the play. Different audience (theatre is high culture as pop culture of TV has outcompeted for a large proportion of people), but possibly similar purpose (entertain, social commentary). Allusions from other texts too (Beckert etc.) as well as values and attitudes (e.g. compare valuing of death in Hamelt to R and G are Dead) etc. Compare characterisation (tragic sympathy from Hamlet to R and G) and language (Elizabethan English to colloquial English that maintains a tension with the Elizabethan fragments).
Do the same for Journeys, Mod B and C.