Foreign students who need to pass exams in English

I prepare students for Cambridge exam mostly. Or improve their skills. I teach online. I live in Italy but I'm mother tongue. I have a CELTA from International School in Rome. I have 40 years of experience. I do have a lot of experience in teaching Italian students. I have also taught Italian teachers online. I use material which I find on internet. I also use zoom platform. I don't have must experience with GCSE exams but I'm willing to learn. I do know that these exams are taken in some Italian schools. It's a step towards future education so could help foreign students to improve their skills in English