Solution

154838

First name
Georgina Fleming
School
Parmiter's
Country
Age
13
Email address
15fleming@parmiters.herts.sch.uk

So you have these cards:
1 2 3 4 5
3 4 5 6
Factors
3 4 5 6
1, 3 1, 2, 4 1, 5 1,2,3,6

The numbers 5 and 3 have the least number of factors so:
55133

Three is also a factor of six and so is two:
5513362

Lastly we have left over two 4’s:

551336244