Are you exploring the courses available at Cambridge? One way to get a quick overview is to look at some of the subject films.
The films are only short, but they explain the structure and opportunities in each course, show you some of the faculty facilities, and have current students giving their views and reasons for choosing each subject, tips for applying from the lecturers, and information about what students go on to do when they graduate.
You may also find the advice about choosing a subject useful, and there are lists of transferable skills for most courses (or options within courses). These lists set out the advantages that each subject gives you for your future career.
The most important question to ask yourself, is what would you enjoy studying in depth?