。
She's bound to pass the exam.
Literal
She [topic-は] surely exam [in-に] will-pass.
Pairing きっと with the bare future-tense verb (合格する, in plain dictionary form) projects the speaker's certainty fully — 'she is going to pass, no question.' Adding ~だろう or ~でしょう would soften the prediction by leaving a sliver of room for doubt; the bare form closes that gap. A useful contrast for understanding how Japanese prediction is calibrated through different combinations of adverb + auxiliary.