If you have an A in a class and you get an F on a test what is your grade now?

If your overall grade is calculated by averaging all assessments, including tests, then receiving an F on one test would likely lower your grade. The extent of the impact would depend on the weight of the test in the overall grade calculation. If the test has a significant weight, it could potentially bring down your grade to a B or lower, but this would vary based on the grading scale and the weight of the test in the overall grade calculation.