The subjects that you need for mechanics are English Science Maths and preferably Technology (you will need to get a grade C or above in all of these subjects to get the qualifications needed to become a machanic)
The specific subjects that a person must study to become a taxonomist vary from one country to another. However, all taxonomists must possess a bachelor's degree in biology from an accredited school. The subjects required for this degree are dependent on the university's requirements.
To become a human resource manager, you need a bachelor's degree. You need to take the school subjects to earn a bachelor's degree that can include English, human resources, and business administration.