BG5GXL First, prioritize academics. Since you're in junior high (Grade 9), there's plenty of time. If the exam schedule doesn't conflict with your school schedule, that's all that matters. Also, you can complete the A-class question bank within two weeks. Create a plan and share it with your family, explaining how this will help you in the future when studying electronics and computer programming.
If your parents are worried about your safety while traveling, there's nothing you can do.
To put it simply, you don't need to take an exam to get started. I also spent several years learning on my own (which was optional), and amateur radio isn't just about buying a handheld device and talking; there are many things you can learn, such as RF, programming, circuits, and PCBs (enough for you to play with for three years). Once you have learned these things, operating amateur radio will be very easy.