Each task one type has the same set of instructions. The first instruction is that You should spend about twenty minutes on this task. You only have one hour to complete Task 1 and Task 2, so it is important that you do not spend more than about 20 minutes on Task 1.
The second instruction is that you should Summarise the information by selecting and reporting the main features and make comparisons where relevant. This means that you should describe the information given, but only about what you see. Do not add opinions or anything else that is not given on your exam paper.
The final instruction is that You should write at least 150 words. Writing fewer than 150 words can mean you lose points.