Trying to catch up on math and seeking for help

First of all hi, I'm a french 16yo student and I have to say I have an awful math teacher at the moment, my average dropped form a 12/20 to a 2.75/20..

Now I know that given school curriculums are different in other countries, it might be harder but I've wanted to ask if there would be someone willing to help me ? (English or french doesn't matter, my English is good enough)

Although I have to say, I am what could be said to be bad at math but I am more than willing to learn as I plan to work in engineering later.

in hope to find some help, thanks in advance 🙏