{31;62;-47;20;-54;689;-112;407;-307}

To prepare for university exams, it's important to understand the concepts and principles related to the subject you're studying. It also helps to practice solving problems and answering questions. Here's an example of how you could approach the given set of numbers:

1. Sorting the numbers: Arrange the numbers in ascending order to make analysis easier. -54, -47, -307, -112, 20, 31, 62, 407, 689

2. Identifying patterns: Look for any patterns or trends in the set of numbers. Are there any positive or negative numbers? Are there any odd or even numbers?

3. Calculations: Perform any necessary calculations based on the context of your exam subject. For example, if the subject is mathematics, you may need to find the sum, average, or range of the numbers.

4. Analysis: Analyze the numbers to see if there are any relationships or insights you can draw. For example, you may notice that the numbers are mostly negative with a few positive outliers. This could indicate a specific trend or scenario that needs further exploration.

Remember, this is just an example of how you could approach the given set of numbers. The specific analysis and calculations will depend on the subject and context of your exams.