text: NaN               NaN             NaN       4           NaN                NaN               NaN             NaN       5           NaN                NaN               NaN             NaN       6          5.20  5th and 6th grade            133.58          131.54       7          8.28  6th and 7th grade            115.58          112.37       8          5.20  5th and 6th grade            133.58          131.54       9          8.28  6th and 7th grade            115.58          112.37       10