As a general rule it is not worthwhile to self-study for AP exams for college admissions. IMO self-studying for an AP exam is valuable only if a student has an abundance of time, an overwhelming interest in a subject, and/or a need to try and amass credits for college (ex. financial need to try and graduate as soon as possible). College admissions officers are not looking for a student’s ability to cram for an exam.
It sounds to me like your time and effort would be better spent excelling in the challenging coursework you have scheduled, making meaningful contributions to ECs and sports you care about, and having some time to relax with friends and family.