Caffeine and Performance
Reducing caffeine intake prior to important mental or physical challenges can enhance its effects. Abstaining for a few days before a big test allows your body to respond more favorably to caffeine. However, those unaccustomed to caffeine should avoid it on performance days, as even small amounts can lead to anxiety and jitters, negatively impacting focus and results.In this clip
From this podcast

Huberman Lab
Using Caffeine to Optimize Mental & Physical Performance | Huberman Lab Podcast 101
Related Questions
Should I ingest caffeine before an exam if I do not regularly consume caffeine, as discussed in the episode Using Caffeine to Optimize Mental & Physical Performance | Huberman Lab Podcast 101 and the clip Caffeine and Performance?
Should I ingest caffeine before an exam if I do not regularly consume caffeine?
How long before an exam should I take caffeine?