Your child's grade is the age they are turning during 2020.  So if your child turns 14 this calendar year, they will be in 14th Grade.

13th Grade born Jan 1, 2007 - Dec 31, 2007 inclusive

14th Grade born Jan 1, 2006 - Dec 31, 2006 inclusive

15th Grade born Jan 1, 2005 - Dec 31, 2005 inclusive

16th Grade born Jan 1, 2004 - Dec 31, 2004 inclusive

17th Grade born Jan 1, 2003 - Dec 31, 2003 inclusive

18th Grade born Jan 1, 2002 - Dec 31, 2002 inclusive