Solution

156921

First name
Dylan
School
Wharncliffe Side primary school
Country
Age
9
Email address
ccoulson@wharncliffeside.sheffield.sch.uk

So I started counting it row by row, it was pretty easy so I won't jump to loads of detail. Anyway here's the answer:

Row 1:1
Row 2:5
Row 3:3
Row 4:5
Row 5:2
Row 6:5
Row 7:2

Add it all together and it equals 23