Queries :: Change Name Field To Display ALL CAPS

My attendance dB has some last name in lower case and others in all caps base on user input. Is there anyway to make it consistent? Also, please there will be about 250 users scrolling through the name column for attendance. What would you recommend for the most user friendly way to display names? How to create a form that would perhaps allow a button for all last name like "A- C" member name

SELECT IIf(IsNull([Last Name]),IIf(IsNull([First Name]),[First Name]),IIf(IsNull([First Name]),[Last Name],[Last Name] & ", " & [First Name])) AS [File As], IIf(IsNull([Last Name]),IIf(IsNull([First Name]),[First Name]),IIf(IsNull([First Name]),[Last Name],[last Name] & " " & [first Name])) AS [Student Name], Students.*
FROM Students
ORDER BY IIf(IsNull([Last Name]),IIf(IsNull([First Name]),[First Name]),IIf(IsNull([First Name]),[Last Name],[Last Name] & ", " & [First Name])), IIf(IsNull([Last Name]),IIf(IsNull([First Name]),[First Name]),IIf(IsNull([First Name]),[Last Name],[First Name] & " " & [Last Name]));