I took SL Language and Literature, so I’m not sure if it applies to you. Anyway, first you need to learn your notes inside out. The best way to analyze texts isn’t to go line by line, but by themes. So make notes on all the themes of your extracts, and highlight quotes in different colors that match your themes.
Secondly, print a clean copy of your extract and write down all the themes and notes you remember, pretend like it’s exam conditions basically. You have 20 minutes to actually prepare so spend that long. Compare your notes to your proper class notes and repeat the process if you missed details
Once you do the actual IOC structure your commentary like this:
Introduction of extract. What is it, who is it by, when was it made, what happened just before this, what happened just after, what was the point of it, who was the audience
Then introduce your first theme. Give a sentence or two explaining the theme and immediately then give a quote explaining the theme. Next analyze your quote by looking at context and literary devices. Repeat this with another quote. You should have 2-3 quotes per theme. And 2-3 themes is good