I think the only advice that should really be given on this test is practice on the printed out versions and priorities in order of accuracy and then speed.
None of us can give advice one how many line’s because in all honesty none of us know how we really did on the day.
For example in practice I could do around 12/13 lines without mistakes.
On the day it felt like I did more, but I may have done less.
The test paper was different size to the A4 so it made it harder to judge, plus I couldn’t go back and count my lines and I still don’t know if I made mistakes or not.
All I know is I passed.
So for all those going in to this test,
…
Use the tool on here, practice on the printed sheets, focus on accuracy but don’t hang about either (remember it’s a concentration test)
And then on the day just do your best.