Sometimes, the game isn't blocked; the launcher is. You can download the official 1.16 client at home, put it on a USB drive, and run it at school.
If you have purchased Minecraft at any point, you already have the best "unblocked" method. You do not need a sketchy link. minecraft unblocked 116 link
Step-by-step for network-restricted environments: Sometimes, the game isn't blocked; the launcher is
Pro-tip: You do not need an internet connection to play Singleplayer. Schools cannot block a game that isn't making network requests. This is the only 100% safe Minecraft unblocked 1.16 link—the link is your own hard drive. Pro-tip: You do not need an internet connection
If you're looking for Minecraft Java Edition version 1.16 ("Nether Update"):
Instead of searching for risky "unblocked" links, try: