Count your average courses mark Open JSOS website and go to the "Indeks" page https://jsos.pwr.edu.pl/index.php/student/indeksOceny/oceny/1. Click "Pobierz więcej..." Open Developer Console and insert this script: const [sumMark, ects] = [...document.getElementsByTagName('tr')] .filter(e => e.classList.contains('data')) .map(e => [parseInt(e.children[7].innerHTML), parseFloat(e.children[5].innerHTML) || 3]) .filter(e => e[1] > 2) .reduce((a, [ec, mk]) => [a[0] + ec*mk, a[1] + ec], [0, 0]); console.log(sumMark / ects); The result is your average mark for all courses.