Note: Before doing any “scanning” make sure you know your local laws on owning and operating a scanner or two-way radio. In some instances it may be illegal.
The HYT TC-310 is a UHF two-way radio (not sold in the America market) capable of frequencies 450-470mhz. The school is operating either on licensed business frequencies or a FRS/GMRS set of frequencies.
The Ronway UV-3R is a “ham” type radio capable of both VHF and UHF operation. The UHF bandsplit is 400-470mhz and is capable of monitoring the school’s radio traffic, granted you have the specific frequencies.
I do NOT recommend listening in -AND definitely do NOT transmit on their channel unless you are licensed to do so.
It is good to know you are aware of the sensitivity of scanning/listening/transmitting on someone else’s frequency.
That said there are two ways to find their exact frequency.
Search the FCC database for their license (if they have one). Search google for “FCC uls search” and you can search for licenses by registered name. Keep in mind, if it’s a school district the license may be under the board of education name.
Manually scan through the frequencies on a scanner until you pick up activity. You will have to be close enough to hear the school ( < 1-2miles ) and listen for names of teachers or the name of the school. You can also look at their radios and try to see if they are VHF or UHF. Best bet is to search 450-470mhz, that’s what most businesses are using.