A major problem in the exam is the length of the texts and you will not have time to read them all carefully. You need to train your speed reading skills so that you can read as efficiently as possible. 2 skills here are skimming which is reading quickly for general meaning and scanning which is looking for specific information.
You may sometimes see advice saying that you don’t need to read in detail. Incorrect. Bad advice. You shouldn’t read the whole text in detail but you will need to parts of the text in detail