Due to the developing situation surrounding the coronavirus, the IB has decided to change the examinations for the spring/summer 2021 sessions. This a table from the IB's website listing the changes made:
The full changes can be found at this site: https://www.ibo.org/globalassets/programme-information/dp/overview_of_adaptations_for_m21_session_for_the_diploma_and_career_related_programmes_final_11082020.pdf
Review these changes carefully -- you may no longer need to revise some components, or perhaps simply some content.
Hope this is useful!