Bundeswehr (compulsory military service), 1973-74. (Well, that wasn't
exactly school, although I learned (very reluctantly) how to drive a truck,
and how to wreck one. Also learned how to shoot (but later became a
conscientious objector).
Studied mathematics and physics (as minor subject) at the
Technische Universität Clausthal
in Clausthal-Zellerfeld in the beautiful Harz mountains of Nothern Germany.
That was 1974-77 and again 78-79.
Then off to Canada for a year (or so I thought!). Studied mathematics
at Queen's University in Kingston,
Ontario, 1977-78 and 79-83.