The DRA2 -WA (Diagnostic reading assessment) begins in K. That's a test of your child's letter and sound recognition. It's done in the fall and spring. You will get the results from the spring testing. If your child is already reading, you can ask for a regular DRA (normally given starting in 1st) if you want to know your child's reading level. There are also math assessments (very basic). See
http://www.fcps.edu/pla/ost/monthly_calendars/2014_15/testing_program_by_grade/14_15_testing_program_by_grade.shtml for all testing.
For curriculum, see FCPS Program of Studies at
http://www.fcps.edu/is/pos/es.shtml.