At the end of the novel, Holden says he may attend another academy in September.
The remark appears in the closing pages of J. D. Salinger's 1951 novel, after Holden has been sent to a sanatorium in California. He says he may go to another school when the academic year begins, but the statement is deliberately tentative rather than a firm plan.
That uncertainty fits Holden's emotional condition. He has been expelled from Pencey Prep, rejected the idea of running away, and struggled to imagine a stable future. His decision is less a triumphant fresh start than a small indication that he may be willing to re-enter ordinary life.
A common mix-up is confusing this September reference with the novel's opening timing. The story begins near the end of the fall term, around the period when Holden is expelled, while the September plan refers to a possible later school year.