Yeah thats fine
social life, depends. I know a lot of friends who took 5 - 6 A levels, do nothing and chill or just focus on the subject they enjoy most (usually math), and then 2 - 3 weeks before the exams of the other subject they start extensive revision and end up getting A - A*. Ofcourse they pay full attention in class. Others revise a lot and have no social life.
You drop the subject you feel you dislike most, or is most useless for your future career that you should choose soon. Or dont drop, you dont have to.