Business Studies A level is a very easy course to take, You should just tell that teacher off or just report her/him. A teacher should not tell their student what they told you etc. I took A level business and i studied for it on the day of the exams and got 75 percent in A level total. I also take A level Maths, English and Computing. I think you will do perfectly fine, even very well in business studies if you do well in Computing since Computing involves a lot of direct learning with application, and Business studies is basically direct learning then make stuff up in the exam that relates to business terms then you do well automatically. In conclusion I think You should just report the teacher and self study business anyways if he/she wont have you in her /his class, then take the exam.