What type of sampling is this 

What type of sampling is this....

I want to distrubute questionaires to five groups of people with different educational back grounds;
• Group 1; No GCSE’s
• Group 2; Some GCSE’s
• Group 3; Higher education (A-levels, college course, NVQ etc)
• Group 4; University Graduates
• Group 5; Academic Professional

To get people to complete the questionaire from group 1-3 i will send them to local schools in my region and ask teachers to make the appropaite kids fill them in.

Is this 'non-probabilisitic sampling?

As i know who they are going to be filled in by (as i am aiming it at people with particular levels of education levels, BUT; i dont know who exactly will be filling it in. as in im not choosing thr particular kid.

So its not random as there all people i want to ask, but i dont know who will be asked in advance( im not picking and choosing the induviduals of that particular level of education_)

hope this makes sense.

Cheers any help appreciated!

Alex