Today, you have to do heavy lifting. I'm saying it's heavy lifting because it's the most tedious task and most people neglect it. Analyse the three mock tests that you gave. Note down the topics which went correctly in all three tests and the ones which got wrong. See if your accuracy was good, because RBI Grade B is a game of accuracy. See if you chose the questions which were easy and everyone would have done them correctly. If not, you need to improve your selection of questions in mock tests. This will have to be replicated in the actual exam. Analyse the time taken to answer each question. See how you can fit more questions in the same amount of time. Find out the areas where you can improve, and take steps to do so. Make sure you understand the concepts behind the questions, so that you can apply the same reasoning to similar questions in the real exam. Lastly, look for patterns in the questions, so that you can predict which kind of questions might appear in the actual exam.
So action items are: