。
My school grades went up.
Literal
I [topic-は] school [possessive-の] grades [subject-が] rose [insistence-よ].
成績が上がる ('grades go up') — 成績 (せいせき, 'grades, academic record') + 上がる ('to rise'). The double-subject pattern: 僕は (topic) and 成績が (subject of the inner predicate). Sentence-final よ shares the good news.