I remember for the reading section what I did was skip to all the grammar/spelling questions bc they were easy and not time consumed, and then go back to the comprehension parts. They literally have a page or more worth of information for 3-4 questions if I remember correctly and it's really time consuming if you're a slow reader (like I am) and still pretty time consuming even if you're fast at reading hahaha. You don't want to be throwing away the marks that you couldn't gotten easily bc you ran out of time (since hardly anyone finishes)).
Personally, I found it easiest to read the question first and then quickly skim the extracts to identify the useful information and then read those parts more carefully. But I know some people who find that more difficult, so it's ultimately up to you to experiment.
I also remember having read a few of the extracts somewhere/knowing the story for some reason so I only read the first few sentences and just answered the questions based on memory. Not too sure if it's still like this, but they might be recycling stories/extracts? If so, reading broadly would be good - even if it's not the case, it'll help you with your vocab and other stuff!!
And if you can't finish it, just guess! lmao, you don't need to do everything perfectly to be offered a place, I remember I walked out guessing half the questions and it was fine!