Some questions are more difficult than others, but they’re all of equal point value. Focus on getting as many right as possible.
A good strategy is to go through each section answering all the easier questions and avoiding difficult and/or convoluted questions. You can guess these and ‘flag for review’. You can then spend any remaining time for the subtest by returning to these questions, safe in the knowledge that you’ve already secured some points on the easier questions, that you are quite capable of getting right, but otherwise might not have had time to read and answer if you’d done the questions in the order they were given.
As there is no negative marking (i.e. no penalties for wrong answers), it’s a good idea to guess questions that you are unsure about or hope to come back later. After all, you have nothing to lose.