random advice:
- be sure to also develop relationships with professors. you may have some solid relationships with student affairs mentors but some applications require letters of recommendation from academic sources.
- be very aware of deadlines and take into account processing time of things like gre scores, transcript requests, and even giving people writing letters of recommendation ample time. you may be ready to turn all your things in, but you won't be able to control these outside things.
- be prepared to have important academic things like tests or papers come up around the same time applications are due and give yourself enough time to balance everything so you don't get overwhelmed the week applications are due.
