It sounds like retaking the year would be a good option, however I would want to move college to another nearby.
The question is, do I take a btec in engineering/computing + Math A-level, or simply retake the 3 a-level at the new college.
I would find I enjoy the btec + a-level combination more, however It comes down to what universities prefer.
I'm looking at Robotics at Plymouth/Reading.