OCR higher paper 4

That paper has frustrated me.

I thought I did okay now my friends r telling me all the answers and I feel so dumb.

There was apparently a similtanioud equation one which I didn’t see any ?
The vectors one I had no clue.
Didn’t know how to prove that 180 in a triangle
I put 1.6/12 which I regret cos u can’t even get s decimal fraction.
The cumulative frequency and histogram I didn’t realise they were 2 separate groups.
And I didn’t know how to do the (a3)1/3 or somehring =1

Ugh I’ve counted I’ve already lost 40 ish Marks

I want a 7 but every answer my friends said I got wrong