I am kicking myself over the circle question. The one about the diameter was a mid-point question where you had an original point and a midpoint and you had to work backwards to find B!
I know right! I Can't imagine what 2017 core 1 will be like!
Dont worry youll be fine, after youve learnt the content maybe around March/April time do past papers every day At least that way youll have a rough idea of where youre at and how to improve. I sat the 2016 paper you did as a mock and managed to get an A. The best advice i would give is to always ask if youre not sure about something (if you dont wanna ask your teacher, ask on TSR )
.... core 1 is supposed to be the easiest, just saying....wait till C4