....

[T]

In 1909 he was sent to Osborne as a naval cadet but passed out bottom of his class.

>>what does passed out bottom of his class.?

>>that is "but he was passed out bottom of his class.."
I guess that he got the last position in his performance while stayed in school...Is that so? :(

[MikeNewYork]

In 1909 he was sent to Osborne as a naval cadet but passed out bottom of his class.

>>what does passed out bottom of his class.?

>>that is "but he was passed out bottom of his class.."
I guess that he got the last position in his performance while stayed in school...Is that so? :(

It sounds like a poor translation. "Passed out" means either "dispensed something" or "fall unconscious". I suspect "passed out" in your sentence should be "graduated at the" or "left school at the".