Maybe I have to update my description.
When you have grade 1 in Austria and you want to covert it to same grade in Lithuanian you need a percent value, since grades 1-5 are not convertible to 10-1.

Well you are right, there is a possibility to change it either to “Fail” or some other value.

Thank you for the nice tips ! I've updated my kata.

Hi ZED.CWT, how were you able to find _f1 and _f2 function names ? What can I do to prevent users of doing this ? thanks.

Fixed, thanks.

good point, I've added a coment, thanks.

I've updated this kata, you are welcome to practise again. Please, don't forget to vote the kata, thanks.

I've updated this kata, you are welcome to practise again. Please, don't forget to vote the kata, thanks.

I've updated this kata, you are welcome to practise again. Please, don't forget to vote the kata, thanks.

ok, I think I know what is the problem here.New test is added, now it should be better.

Random tests are added, thank you for the feedback.

Thank you for this feedback, I've improved my description and added some empty missing functions.

Tests are improved.

I see, thanks, I'll change it.