I'm going to apply for a mechanic's apprentice in BMW, and I'll interview tomorrow for professional advice.

Don't worry, first of all, don't be too nervous. What questions are about which stores? Students interviewed BMW apprentices before. Some stores are almost all professional knowledge, but they are also elementary and simple, and others are not asked. Some shops don't ask professional knowledge at all, only personal and career planning. Others ask a few professional questions, such as engine composition, air conditioning composition, cooling system composition and so on. But none of this seems very important. They mainly look at your personal attitude, whether you are suitable for this position, your attitude towards work and your salary requirements. Anyway, I have interviewed twice. The first time I was asked about vomiting blood, the second time I completely controlled it and passed. I hope you can succeed.