You have a personal deadline that is four months after you open your candidate portal/are accepted as a candidate. The earlier you start, the earlier everything is due. There is no single final date like at USMA and USNA. You have to absolutely pay attention to the date listed in your personal application page. If you start 4 August, your deadline is 4 December.
So, if you are struggling--start training now--and open your portal in late August and give yourself the fall semester. You do not want to wait. Remember, you also need to plan to apply for all of your possible nominating sources, take the SATs/ACTs again in Sept/Oct, and you want time for the DODMERB as well as gathering letters of recommendation, transcript requests and other items. If you are healthy, a good CFA score is within your grasp--start now with the practicing and time your application window to support reaching your goals.