Alaskan is correct. As a Junior, it is too late to apply for AIM for this summer. I would continue with your research about the Academy and the various CG missions in order to decide if that is truly where you would like to go. Visit the Academy if you can, talk with current cadets, search out graduates, etc.
If there is a sport at which you excel, fill out the recruiting questionnaire (uscgasports.com/information/recruiting) and contact the coach.
You'll need to decide if you are going to apply early action or regular admissions. There is plenty of discussion on this forum regarding the merits of both. Use the search function to locate the related posts. However, a word of caution regarding this forum: while there is a lot of good information that can be found, you will also find uninformed opinions, so beware.
Make sure that you understand the application process at cga.edu and start assembling your application when admissions opens them for the class of 2022. Decide who you would like to have write letters of recommendation for you. Read the testing requirements and training suggestions for the PFE and start training for it. Hopefully you are already taking Honors or AP level math and science classes. Do whatever you need to do to maximize your SAT and ACT scores.
Good luck with your college searches and with your application, should you choose to apply to the Academy.
