Ask your teacher to tell you where your weaknesses lie and try to target them. The main part about doing a subject well is having a passion for it and you have that so its a good start. Focus on revising more consistently and knowing which topics in the spec you don’t know. Do as many past papers as you can and revise key terminology. You still have a year till final exams which is plenty of time to get into a better routine for the second year of content, and perfect the first year content