Hello, everyone!

I am computer classroom administrator. When our teaching need to install some teaching software, we have to install them one PC by one PC, which often takes much time and energy.

Could you give me a good idea? Thanks!  
Do you have a license to install the same software on multiple machines?This leads to the QUESTION of software sources. The vendor of the software may have some provision for rapid install if the software is purchased by an educational institution.

An alternative is to find SUITABLE software that is portable.

Such software does not need installation in Windows, It just runs 'as is" and a shortcut can be placed on the desktop. This is often the case for free software  under  GPL where  the authors doe not want monetary tribute. (But require your RESPECT.)

(This is not the same as cross-platform software.)
Here is a list of things in the category:
List of portable software - Wikipedia, the free encyclopedia

The above list is by no means complete, yet it is very IMPRESSIVE and can be of great value in an educational institution. Some of these are GPL, you would have to check to be sure. Under  PRESET interpretations of copyright law even public schools are subject to license restrictions of copyrighted material.