When you click ‘FINISH’ it will finish the *whole* test – not just the section. The whole paper was out of 30 which is why it told you the score was 7/30.
The idea is that you are not allowed to move on to the next section until the time for the current section is up (to be like the real exam). However, we will probably add a ‘MOVE TO NEXT SECTION’ button soon because that will probably suit most users better.
You can do the test again at no extra credit cost. The parent / tutor can just assign it again.