I think this needs to be said. Take a look at the documents for yourself:
https://www.wmagazine.com/story/jackie-kennedy-filled-out-john-f-kennedy-jrs-college-application
The handwriting in the application itself is different from the handwriting on the Freshman Questionnaire, which students fill out after they have been admitted and committed to Brown. John, Jr. was in Africa and it was quite a while ago–much harder to ship materials in a short time frame.
The author of the original magazine article did not seem to understand the difference between the application and the Freshman Questionnaire. It has practically gone viral that Jackie filled out the application. But I see no evidence of that.