Be careful with your time
You should spend 30-35 minutes on the Use of English and 40-45 minutes on the reading.
Order of exercises
It is generally a good idea to do the Use of English exercises first as you can finish them more quickly. With the reading exercises do them according to how difficult you find them, with the most difficult exercise last.
One thing that will never change is that your answer sheet is king. With computer correction now used for much of the exam nobody can guess what those empty spaces on the answer sheet might have been so it very important to put an answer to each question if possible.
Remember too, if you do the paper-based exam that the 10 minute reminder at the end of the exam may be too late to start copying your answers . The 5 minute reminder certainly is and you will not get any extra time to finish copying all of your answers.