With sociology it's really all based on memorising content including key sociologist thinkers. Once you know the content the next step is knowing how to tackle the questions in the exam i.e the structure of your answer for each question, what to put in your intro, conclusion etc. Ask your teacher if they could help with the latter if you find yourself struggling to actually answer the questions in the exam, but in general just try to understand the content thoroughly before each exam is my advice.