Masquerading private LAN to private ip

I'm helping out to setup the Internet access for a local school.
I've found out that the ISP is providing private IPs to the school,
the info is as follow:

ip range: 10.145.0.1 - 10.145.0.62
mask: 255.255.255.192

The school has about 200+ computers with only max 62 usable address,
so I tried to setup a NAT router to masquerade the local LAN
(10.145.8.0/255.255.254.0) to one of the provided IP. Theoretically,
this should work, but it is not.

My question is:

Can I masquerade the entire LAN in private IPs to a private IP which
belong to the ISP?

10.145.8.0/255.255.254.0 -----> 10.145.0.1 ----->
ISP -----> Intenet
School LAN (in private IPs) ISP's private IP
most probably ISP masquerade to Internet


Thank you!

.

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