Solution

156300

First name
Bhaskar Ghildiyal
School
Primus Public School Bangalore
Country
Age
10
Email address
anjuli_joshi@gmail.com

I searched for the all possible factors of given numbers in the Mystery Matrix. Then I used Hit and trial method to fill the other empty boxes.When I saw 49 ,42 I thought 7 can be the number which can be repeated twice.