This userscript conceals scores on the AP score report page until you reveal each score individually.

conceal_scores.user.js

// ==UserScript==
// @name         Conceal AP Scores
// @namespace    https://jaeheonshim.com
// @version      1.0
// @description  Conceals scores on AP score report page until you reveal each score individually.
// @author       Jaeheon Shim
// @match        https://apstudents.collegeboard.org/view-scores
// @icon         https://www.google.com/s2/favicons?sz=64&domain=collegeboard.org
// @require      https://gist.github.com/raw/2625891/waitForKeyElements.js
// @grant        none
// ==/UserScript==

(function() {
    const linkCSS = "cursor: pointer; text-decoration: underline;";
    const customStyles = ".apscores-badge-score { display: none; }"
    $('html > head').append($(`<style>${customStyles}</style>`));

    waitForKeyElements(".apscores-badge-score", function(node) {
        node.parent().children("a").remove();

        node.after(function() {
            return $(`<a style="${linkCSS}">Reveal Score</a>`).click((e) => {
                node.show();
                $(e.currentTarget).remove();
            });
        });
    }, false);
})();