Best advise, just do your best and be as close to 300 as you can.
That is good advice. However, sometimes choices need to be made with the limited hours available in the day.
Let's suppose a cadet is at 270 on the APFT. To get to 300, this cadet would need to devote one
extra hour per day (7 hours per week) to conditioning, beyond what they're already doing. What does the cadet earn with those 7 hours? If the OMS points are proportional as I suspect they are, then this cadet gains 1.35 OMS points by going from 270 to 300 on his/her 3 APFT test that are a part of the OML.
Is this a good use of those 7 hours per week? What if studying an extra hour per day, over the 3 years of college classes that are part of the OML, would raise the cadet's CGPA from 3.0 to 3.25? That's 2.5 OMS points for the same 7 weekly hours, which is almost twice as many additional OMS points vs. using those 7 hours for APFT training.
What if devoting those 7 hours per week to Battalion leadership activities would increase the cadet's OMS points awarded by the PMS from 14 to 19 out of the total possible of 20.25? That's 5 OMS points increase for the same 7 hours/wk. Again, 2x as much improvement vs. extra studying, and 4x as much improvement vs. conditioning.
There are not 21 extra hours available to most cadets beyond their current activity. A cadet doesn't have unlimited hours. A cadet must choose where to put the hours for improvement. Obviously every cadet will have a different and unique amount of hours needed to improve grades vs. APFT score vs. Battalion Leadership that lead to the PMS score. But each cadet needs to understand the rules of the OMS game, and where the biggest bang for the buck comes from in terms of extra hours devoted to improve one area vs. another vs. another. The scoring system is not a secret. Any rational cadet would want to know where his/her extra hours are going to result in the greatest improvement in OMS points. You cannot equally focus on every area... there just aren't enough hours in the day. Priorities must be established and choices made based on how many points improvement come from effort devoted in different scored areas. This isn't any different from a decathlete. Each athlete has to identify in which of the 10 events will an extra hour per day yield the biggest jump in points in a meet. If an athlete has plateaud in the 100 meter run, then maybe the pole vault is the area where he/she could gain the most points for that extra hour per day of training. Or the shot put. Or a combination of 30 extra minutes on high jump and 30 extra minutes on javelin. Or whatever. The point is that an extra hour of effort per day will yield vastly different levels of improvement in decathlon event points depending on the athlete's genetics, and the event.