If you get stuck, ask for help. Explain what your thinking is, and how you plan to tackle things, and explain what help you need to solve your issue. If you get the job, your employer can work with you if they know you’ll ask for assistance when you need it - they expect to provide training or helpful oversight to any new starter. In the interview test, they are checking your basic knowledge, and also whether you are teachable.

Banks are experts at providing loans. Car dealerships should be expert at selling cars. Asking the car dealer to be a bank is like trying to buy a telescope from a hat shop.

Swearing is brilliant if you smash your thumb with a hammer, or break something expensive. If you swear all the time in normal conversation you don’t have any special words left to use when those things I mentioned happen.

Catenary is the magic word here

if the device switches off while in use on charge, that’s too slow. if the device switches off whilst charging because it overheats, that’s too fast. in between, forget it, the electronics will handle everything, and yes slower charging is better for battery life but you needn’t obsess over the difference, it’s there but unquantifi able. if you’ve heard anything other than this advice and you believe what you’ve heard, there’s not much point in people here trying to guide you.