In the last fourteen days, 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, once each.
Re-read your error log 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 error log one last time, pack your bag, walk to the exam centre once so you know the route.