ETA which stands for Estimated Time of Arrival, and is really an acronym and not an abbreviation.
Psspt. That might be the abbreviation of passport.
might be Rep
I think it might be: m.a.
As you might guess from the frequent reference to federal officials as "feds", the normal abbreviation for "federal" is "fed."
It might be an abbreviation for Spanish.
This will depend on the type of certification. Each of them will have a different abbreviation that should be used.
"TYO" is the IATA city code "TOK" might be used an informal abbreviation that uses the first three letters of the city name.
Seems Prin. is the commonest abbreviation. If the reader is expected to know that "Principal" might be used, then P.could be used. Target your audience appropriately.
CheMin does not appear to be an abbreviation for anything, although it might be the name of a company. Chemin, however is the French word for road or path.
You might be referring to a BSc (bachelor of science degree).
Sp is not a symbol for a chemical element.
In the UK, MP might be an abbreviation for Metropolitan Police or Member of Parliament.