would you be required to complete the AS required practicals on the same year as sitting the AS exams or can you complete the practicals for the whole A level in year two? if that makes sense
The practical endorsement only exists for the full A level so there is no need to have undertaken the practicals to take the AS, nor is there any need to take AS exams at all - it doesn't contribute to the final A level grade and the whole A level content (including that in the AS) is examined in the A level exams.