The job interview is for a classroom support , working with young people with SEN and standing in for classes, when the teacher is off sick
You are very welcome. One thing my school does now is to ask LSAs to generally direct the room on what they've just taught, while they (the teacher) are meant to do 1-1 with the weakest. Research finds that more effective allegedly.
It doesn't always happen though!
In terms of you doing general support or SEN support, you are trying to make the students think for themselves as opposed to enabling them/doing it for them/making them reliant on you.
So you tell them BRAIN then BOOK then BUDDY then BOSS (you or teacher) in that order. Try and prompt them without over-scaffolding. Ask them open questions. Encourage them to mind map/list what they know already. Train them how to use glossaries, thesauruses, dictionaries.
If you are acting as a scribe (some may have that as access requirements at GCSE) make sure your writing is printed not cursive so they can read it and get them to dictate what they are thinking - don't just do it for them.
Try and teach them self-calming strategies - counting to ten, breathing, writing a few sentences to build from, especially if disinterested, stuck or blocked. A piece of plasticine/blu tac calms many if they do not or are not allowed to have fidget spinners etc
Resources - word banks for gap-fills, sentence starters for paragraphs, key stone words (keyword lists) for literacy. Many have Knowledge Organisers now that they should refer to. Some schools still have planners with extra pages like maps, formulae etc that can be referred to in class.
Do be careful not let them use you constantly for cover when they are slammed, if they have advertised the role as an LSA/TA role. Really, only HLTAs should be asked to do cover - even then, not all the time.
If they wanted a Cover Supervisor full-time they should have advertised for that rather than sneaking it in via the back door! 
I need to eat, and mark, and eat some more, then get my Strictly fix, before I come back to you but please ask if you have any questions. Safeguarding for example or GDPR, I can help you with if you need it. Do look on their website and their social media. Many of their policies will be on there.