What would be the best strategy for the last month to get closer to 99 percentile?

Since, its last month you should not start off with new topics , rather focus on revision and mocke xams where you can identify how much time you consuime for wrong questions and find out right approach to solve the same. You need to select and cherrypick questions to get good score within less time. Hence, its advised to have accuracy and watch atleast one news channel everyday plus one newspaper everyday. You wont get accuracy by leaving questions, try to solve all problems initially and where you go wrong solve such questions more to make your weaknesses redundant, once you do that your confidence will boost miles away. Secondly, give maximum mock tests and make sure you dont repeat same mistakes again. once you're done with that you can then choose and select certain questions in final CAT exam to score great percentile within less amount of time for maximum accuracy. All the best for future endeavors.

If you are aiming to get 99 percentile you might have given a good number of mocks and have analysed your performance. You might have also covered all the basic and advanced concepts.

Now firstly analyse your strengths and weaknesses from your mock test analysis and prepare a suitable strategy to maximise your percentile. Also you need to identify the questions that you can surely do in the actual examination in all three sections and focus on getting them correct and then proceed to other questions.

You need to have both accuracy and speed to score as high as possible in actual examination. You also need to keep yourself calm, composed and focused during the actual CAT examination.

All the best!