Amateur Extra Next

My current plan is to take the test for Amateur Extra before June 30th, 2024, less than two months away. I've been doing practice tests. Ham Radio Prep has a good study product for all of the exams, but it is not free. hamexam.org offers practice tests online for free. There are free Android apps called HamRadioExam by Roy Watson, N1ZTL. There are numerous other sites which require creating a login, such as ARRL Exam Review.

The biggest challenge is the math.