For the close analysis ones (both of the prose ones and the first - I think - Virgil one), just do point, evidence, analysis (PEA). It's never a deep question, you just usually need to say how X makes this passage vivid and dramatic, or how he emphasises Y. ALWAYS QUOTE THE LATIN. You only get half the marks if you don't so back evey single assertion up with a quotation. Try not to reuse the same technique in the same essay, e.g. talking about emphatic position twice, even if you're making a totally different point about a different phrase: they might be mean and not credit you. I'm not an expert but my structure's usually like this:
1. Virgil makes this passage vivid by comparing Dido to a deer, a 'QUOTE' which has connotations of X, which is highlighted by its emphatic positioning. More analysis about deer simile.
2. Virgil makes it vivid by emphasising the pain she feels. Analyse techniques which emphasise that.
3. The passage is made vivid (mix up the syntax of your essay a little omg) by reminding us of the gods' intervention.
Basically just carry on until you run out of points or time, whichever comes first :P
The wider Virgil one requires more thought. I'd try to plan and structure that one before starting it, maybe with 5 paragraphs or something, but it always depends and you think of more points as you go along often. You don't have to quite but I think it's good to back your points up with references to specific moments in the texts, e.g. However, Dido is portrayed as a victim of the gods because Venus and Juno discuss and interfere with her life without considering her feelings or fate, only that of Aeneas.
Hope that helps a bit
Has anyone got any miraculous tips for how to learn all the grammar you've not learnt since the Cambridge Latin Course? I only learnt the endings for the declensions this year and I'm still iffy ony 4th and 5th which sucks because Livy loves 4th. -_- Or vocab learning tips?