Chrome on laptop, wherever there's a drop down option use it and don't type manually in the box, where a date is needed use their calendar. Don't accept any autofill, where typing is needed do it manually, eg address.
I don't know of any I'm afraid as I'm working out here, there may be some on here already so take a look at the search function. Alternatively, this may be a case where Google is your friend.
the visa is legit as in it's legal but if you're not actually volunteering then you're in breach of your visa terms. There are foundations which you can volunteer for and get a visa through them, again not cheap but at least you don't run the risk of falling foul of immigration nor being held hostage by an agent.