In the last fourteen days before the exam, the answer to almost every 'should I…?' question is no. No new textbooks. No new practice sets. No all-nighters.
Do sit two full papers per subject over these two weeks under exam conditions. Mark them. Re-do only the questions you got wrong, one time each.
Re-read your 错题本 twice this fortnight. That is the highest-leverage reading you can do.
Sleep goes up, not down. Nine hours a night, non-negotiable. This alone is worth several points on paper 1.
Three days before the exam, stop doing full papers. Skim your notes, review the 错题本 one last time, pack your bag, walk to the exam center once so you know the route.