=COUNTIF(Sheet1!G10:G15,"<60")
=COUNTIF(Sheet1!G10:G15,"<70")-A1
=COUNTIF(Sheet1!G10:G15,"<80")-A1-A2
=COUNTIF(Sheet1!G10:G15,"<90")-A1-A2-A3
=COUNTIF(Sheet1!G10:G15,"<100")-A1-A2-A3-A4
=COUNTIF(Sheet1!G10:G15,"<70")-A1
=COUNTIF(Sheet1!G10:G15,"<80")-A1-A2
=COUNTIF(Sheet1!G10:G15,"<90")-A1-A2-A3
=COUNTIF(Sheet1!G10:G15,"<100")-A1-A2-A3-A4