Tips for fatigue resistance?

Currently in a 173-174 rut (past 4 PTs). Need to climb to 176+ consistently before the November exam (so around 2.5 weeks). My blind review's are consistently in the 176-180 range, so I know that I'm conceptually adept and not lacking in understanding.

My main issue is fatigue. Around the 2nd-3rd section, I get fatigued and find it slightly more difficult to stay honed in on the next 2-3 sections of the exam.

Looking for general tips on how to build fatigue resistance / be able to stay dialed in on all 4 sections without a drop in focus and vigor.