I welcome all type of students. Please challenge yourselves in mastering new languages as it needs a lot of effort and can be stressful. But keep in mind that you can even study from the smallest things; movies, music, books, etc. It is not always about learning new words, it is also about learning new perspectives.
For language used in fields of expertise, I am specialized in Business English as I worked for 3.5 years at an accounting firm.