Now that you have decided, let's do it! You may delay, but time will not. I didn't realize the necessity of studying A-level until I graduated from high school and went to college in England for one year, so I decided to drop out of college and study A-level courses in China. I am 20 years old this year. I won't really go to college until I'm 22, but I don't think it's too late.

If you want to apply for a good university in a Commonwealth country, you must have an A-level grade. From what you described, you are very suitable for A-level. The most important thing to read A-level is the language foundation. I wonder how good your English is. IELTS Band 6 reads A-level, and English is no longer a problem for me. The key point is that my physics and mathematics at school are not very good, and I almost forgot all about it after two years. However, A-level is really not difficult. You should be able to study on the basis of good English, so start taking A-level courses now. If you study hard enough for two years, you can apply for a world-class university.

In addition, you must find a good school, and it is best to help you apply for a university (but generally), and then look at the learning environment. If everyone in the class goes to a good university, you will definitely redouble your efforts, and vice versa!

That's all I can say. Since you have such an idea, let's put it into action. Come on!