Your speed while you are attempting CET or any other exam, depends on three main factors: your knowledge, how quickly you can recall, and how quickly you can convert your knowledge into words and solve problems. The more knowledge you have acquired, the more confident you are at taking risks and not wasting substantial time on trivial questions. For this, you need to have solid basics. Some basic strategies you can adopt are
Most importantly, give as many mocks as possible because the more questions you have solved, the more the solutions have become a part of your muscle memory.