We are unable to disable "FIle" tab in ribbon.
The link "https://stackoverflow.com/questions/51435554/how-to-disable-file-button-in-ms-word-2013" you may have a look.
Did you grey our following commands via group policy: Microsoft Office Word 2016 > Disable Items from User Interface > Custom > Disable Commands
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SetLanguage |790
SpellingAndGrammar |2566
Thesaurus |9056
To prevent students from using proofing tools during exams, you can go to: File > Options > Language > Choose Editing Language
, add a new language, ensure the language that students use is not the preferred one, then uninstall/remove it.
Before students take exams, please disconnect from the external web connection.
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