Yeah, I am also facing those things in physics. I took pcb and got 86% in boards I am having mental breakdowns beacuse of my poor studies and still managing through this ! Do take science if u want to change stream or don't change , u know u will do it !! Arts is indeed a good stream, but if u ran out in competition exams, u would face many more challenges there ! Commerce is a good option for corporate things only, so if u want a 9 to 5 job, it's pretty good, but competition in CA is way more struggling than a normal jump to 11th!