Peter Sereinigg noticed that when quiz attempts build on last one and questions are on several pages, the score is not calculated correctly - the problem is that when you press the finish button, only the score from the active page is calculated.

Steps to reproduce:
1/ create new quiz - Each attempt builds on the last-yes, Questions per page-3, Attempts allowed 4
2/ create more than 3 question and add them to quiz
3/ make first attempt - select some answers
4/ make second attempt - but now only press save Submitt all and finish on first page
5/ make third attempt - but now only press save Submitt all and finish on second page
6/ each score is different - first is ok, second sums grades only only from first page and third from second page

Attaching sample backup from latest 1.6.3+