If u r slow in problem solving that means either ur speed is slow or u r not confident enough with ur concepts .. so if it’s the 1st case thn practice question with ur timer on bcoz practice makes a man perfect .. and if it’s the 2nd case thn work on ur concepts there r so many wonderful teachers who can help u just watch their vid of whatever topic u want and then try to solve the questions .. make formula sheet and practice as much questions as you can .. I hope this will help u ..! All the best 💕