Install rainmeter here either beta or final release, I'm using beta version 4.4.
Simple Rainmeter Skin showing Muslim 5 prayer times based on location and school using free prayer times api
These are the variables to change according to your specific location and school of choice
Edit PrayerTimes.ini under [Variables]
; default values
City=petaling-jaya
School=9
You can get list of city ID here
And list of school IDs here