You can not downshift that fast with an F20. Rev matching is a good idea, since it will prevent the rear wheels from breaking away when you take your foot off the clutch pedal. When done during braking, it requires some heel/toe action, as you will need to operate all three pedals simultaneously.
I recommend practicing heel/toe in public traffic during daily driving.
If you are not familiar with heel/toe, I recommend braking into the corners with the high gear you had, then open the corner a little before going back on the throttle and do the downshift mid corner after your are done braking.
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