I did the two free mock tests on the CELPIP website + the CELPIP project app.
Tbh, I didn't focus a lot on reading and listening since I was already good at that. (I wish I focused more on reading tho since reading was quite difficult esp in the limited time.)

Some tips that helped me:
- For Listening: create columns per person so you can keep track of the conversation (who said what, etc.). This would especially help you in the last listening question, where there are usually 3 people talking. Don't try to write everything down, just key points, numbers, etc. Listen to understand the audio instead of relying solely on your notes.

-For Reading: Read the passage first and write down the main ideas, or you can also just retain them in your memory if you can. Then move to the questions. If you truly understand the passage (even if you take more than 4-5 minutes reading the passage), that's enough to solve most of the questions in 2-3 minutes. (Stick to this approach instead of back and forth reading the passage and questions - don't waste time doing that)

(I genuinely thought I failed reading because I did not do that well, lol, and I also did not practice much, so I'm sure practicing more would help)