Below are my suggestions:
1. Think about the careers that are automotive related and find out more on these careers
2. Determine the careers you have interest
3. Speak to someone who are working in these careers. Seek guidance from your mentor, school career counsellor, parents, etc.
4. Shortlist 1-2 careers you would like to pursue
5. Explore the entry criteria of relevant subjects in the college
Hope this helps! Good Luck!