*Loan,banking and credit>>>health insurance

When someone gets new insurance, (health, life or home) do they verify if you have graduated from highschool?

it is irrelevant unless it is a coverage requirement for insurable purposes like if you are putting child on your insurance (usually auto or health) and they have age limitations like "still in school" or "under age 22". That is mostly used for a rider for minor children. For life, it does not matter. It will cover child up to certain age for the term rider.

No, that is not a question on the application.
its up to the company
ONLY if you're trying to claim a student over the age of 18 - they check that person's student status (enrolled full time in school or not.)
I'm a medical biller
It depends on the company. Some companies are now using your education level as a factor in tier scoring which, along with your claim history and credit score, determines how much you will pay for your coverage...
No, there's no point to it!!