Two RTC examples are included in the MAX32625/26 SDK/API. One is in a directory named RTC and the other in a directly named RTC_SysTick. These and other SDK/API examples reside in the EvKitExamples folder. The difference between the two are:
RTC - Shows an example of how to sleep from LP3 (run mode) and wake-up from both LP1 and LP0 by using the RTC compare wake-up triggers
RTC_SysTick - The RTC with combined with the SysTick timer makes a 32kHz resolution timer that can keep an accurate count while in LP1.