If teaching is your career goal, then you'll need a degree. First, however, you will need to have the equivalent of at least a C in GCSE maths and English.
If you want to teach in a primary school or up to GCSE level in a secondary school, you will also need the equivalent of at least a C in a science subject. These are needed to teach and are in addition to any entry requirements for your degree course.
There are two basic ways to achieve a degree and then go into teaching:
Postgraduate routes ( You can take a degree related to the subject you want to teach and then a postgraduate teacher training course (such as a PGCE).
Undergraduate routes ( …