Ooooh, I know what you're on about. I have got it completely wrong, A2's for the old spec will finish in 2019.
Edit: I'm sorry I have no idea which exam board you're on but if for example you're taking old spec OCR maths they state "The final assessment opportunity these qualifications (3890-3892, 7890-7892) will be summer 2018. Resits will be available in summer 2019."
This is likewise for other examinations on the old spec too.