"I passed all the tests, but the GED math test. I scored a 400 and I need a 410. What can I do".
Believe it or not.... you are NOT alone. I have worked with several students who have scored between a 380 and 400 on their math test.
For most of them, they needed to go back to the basics and review fractions, decimals, and percents.
I know, I know! You just want to take the math test, pass it and get on with your life. You might be someone who can review and retake the test fairly fast..... or you may need to study for awhile and after a month or two.... then retest.
My advice. Find a good book and a good tutor. Take your time, be patient with yourself, and you will know when you are ready again to attempt the GED Math test.