If you are 16, you should be a high school student, right? It's best if you have connections at school. Let the school help you get an admission ticket for the college entrance examination, and at the same time, your culture must pass! If the cultural achievements are not enough, you can only buy three books with money. You can only teach yourself or find a cultural training class for the college entrance examination. I don't know if you usually have textbooks for senior three. If so, it may not be too late to go to training now, otherwise it will have to wait for next year.
If it doesn't matter, you can try it through the path of "adults applying for universities", but you have to study in high school for three years before you can be admitted. There is another risk. The Ministry of Education may check your background to see if you are a student. If found, you will not be able to take the exam. It doesn't matter unless you drop out of school or haven't been promoted in the first place, and the state can't control it.
Someone has taken the exam before! You can also try.