Be as up-
See this excellent blog for language news of the week, maintained by a teacher of A Level English Language.
Other useful links are collected here.
Obviously, jargon is often specific to occupations -
This is not a topic I will be giving you extensive lists of vocabulary for, but there is an article below about doctor slang. You may also like to ask family members about slang specific to their profession, to give you a few examples to draw on.
I wouldn’t expect a full exam question on occupational variation (but then I don’t set the exams!), but it would be a useful part of a discussion on the sources of an individual’s different dialects or registers.
Equally, people’s hobbies and interests will give rise to different registers/dialects. Hobbies such as stamp-
Here’s the full BBC article about doctors’ slang