I just got my BTEC certificate, but wtf?

So, I moved from Sweden to London one year ago. I came to this college not aware of anything..

Today I got my grades, we did 10 units total, why are they only grading 7 of them? The worst thing is that they chose the units I've done worst in? Please help? I got a pass overall and I'm really disappointed because I had:
2P
6M
2D

Thank you!

So, I moved from Sweden to London one year ago. I came to this college not aware of anything..

Today I got my grades, we did 10 units total, why are they only grading 7 of them? The worst thing is that they chose the units I've done worst in? Please help? I got a pass overall and I'm really disappointed because I had:
2P
6M
2D

Thank you!

What year are you in? The diploma you are doing, is it single, double or extended?

I'm in the first year, I'm doing subsidiary Level 3

Whats the problem then? All the grades you wrote about add up to 10?

Yes when I calculate them it says I got a D overall, but in certificate i got it says I have a pass only

i swear if its level 3 first year you get 2 grades