You need to use the Repeated Item Scope so that you access the relevant repeater item. You should do something like this:
exportfunction StudySummary_click_1(event) {
let $item = $w.at(event.context);
let q = $item('#StudyDescription');
... the rest of your code ...
See the at() API doc for more details.
Also, variables q and a are both set to the #StudyDescription and therefore are equivalent. What are you trying to do with q and a?