I agree, buy the pull up bar.
We did this for DS. Made a rule everytime he entered or exited he had do a min of X pull ups, and each week we increased it.
You would be amazed how often you enter and exit your room daily!
He has siblings so if he tried to enter/exit without doing it they would scream in the house that he needed to do it.
Within weeks he went from 3 pull ups to 13, and eventually to the max of 18 within about 2 months.
I know you are a girl, but if you start off with just 1, and increase by 1 every week or 2, by the time you do the CFA you will be maxing.
If I recall correctly, the AFA has a min that they do not post, and if you fail to meet one of the mins, but max everything else, you still fail. In other words max the run, fail the sit ups, and you fail.
Only the AFA can open the portal to re-take the CFA, once submitted it is up to them.
Finally, look at the CFA as the one area you have complete control over. Think to yourself, there is always going to be 1 last apptmt and at least 2 people will compete for it. Do you want to lose that apptmt because your WCS was lower because you did 1 less pull up on the CFA and that lowered your score?
Every point matters!
Good luck.