Sumif/s maybe! + percentage

Hi

I need to do two things in the attached spreadsheet.

1. On the 'reading' sheet in cell b5 I need to insert the % of kids from column 'A' (PP-FSM) on sheet 'class information' who have achieved the mark 1a, 2c, 2b or 2a (on reading sheet) as a proportion of the total number of children (cell b4).
2. I need to do the reverse of point 1, i need to show all the children not in column 'A' (PP-FSM) on sheet 'class information'.

Thanks for any help that you may be able to give.