+0
Please check out the following sentences.

(1) It's lucky for me to pass the admission test of Math Class.

(2) It's lucky for me to pass the selection of Math Class.

(3) It's lucky for me to pass the screening test of Math Class.
Comments  
Do you mean that you barely got a passing score or that passing the test made your life better?
It means that I have to pass the exam so that I can be admitted into Math Class to study.
Teachers: We supply a list of EFL job vacancies
I know, but you didn't answer my question:

Do you mean that you barely got a passing score or that passing the test made your life better?

I need to know that before I can correct your sentences.
It means that I had to pass the exam so that I could be admitted into the Math Class which is for students with outstanding performance in math.
Let's try it again:

Does 'lucky' mean that you barely got a passing score or does 'lucky' mean that passing the test made your life better?
Students: Are you brave enough to let our tutors analyse your pronunciation?
Here 'lucky' is a way of humble expression in this sentence.
Well, it does not express humility, but 2 other things. In any case:

Luckily, I passed the admission test for the advanced math class.
Luckily, I was admitted to the advanced math class.