it depends on the basic knowledge you owned
if you can pass each/ most tests
all you need to do is to take revision carefully
so as to enssure you can understand the content clearly
i think you can get at least 3 in hkcee if you follow my suggestion
if you want to get >5 in hkcee
but have not owned such ability right now
you can try finding tutor
if you have any other Q, you can contact me [email protected]
hope that help you!!!