Here are a few different ideas (not listed in order of importance):
1) Practice with the following timing parameters: 4 minutes/5 question passages ("data representation"); 5 1/2 minutes/6 question passages ("research summaries"), and the remaining time for the "conflicting viewpoints" passage.
2) If you are matching data points in a question to a figure, write those points on the figure in the right place so you don't waste time going back & forth. Also, when a figure has a few lines and a key, write the names from the key next to the lines to avoid careless errors (e.g. the top line of two lines may represent the smaller metric but your natural tendency is to assume that it's the larger one).
3) Here's what you should read before you start answering the questions: Data Representation passages - NOTHING; Research Summaries - read the introduction so you understand the research/experiments; Conflicting Viewpoints - FIRST, glance at the questions to see if there are a lot more questions that pertain to one of the passages. Needless to say, read that passage first to ascertain that scientists opinion. Then, read the 1st sentence of the other passage to ascertain the contrasting opinion. Now answer the questions for the passage that you read first.
4) The questions in each passage get harder as you go. If you're behind on time, make an educated guess on the last question(s). In other words, quickly read the questions, eliminate obviously wrong answer choices, and then guess.
5) Generally speaking, it's easy to match data from the questions to the appropriate figure (i.e. to find the figure with the appropriate data points). If you cannot quickly match the data points, that's a signal that you need to read a part of the passage to answer the question OR use logic to answer the question.
6) After you read a question, always glance at the answer choices before you go to the figures. This gives you a sense of what you're looking for.
7) One exception to item #3 above: If you happen to get a passage on a subject that you know well, you should quickly read the background information and understand the figures before you answer the questions.