With problem questions, make sure you know the Law. As long as you talk about the relevant law applicable to the scenario, with reference to the cases then apply the law to the facts. As long as you get the law right then it is fine. Follow the IRAC method-- Issue, Rule, Application, Conclusion
With essay questions, it is essential for you to do extra reading and having your own judgement with supporting evidence. Also, be able to have balance in your arguments.
If you are revising criminal, then finding information should be quite easy, but if you are doing contract then make sure that you know your cases well as the law is highly based on case law.