Hi
i'm tryng to make an assessment yes/no (list box question) with a value

at the end of each group i want a message that give the total and a comment
but should be usefull to have a list of wrong answer or a text with the right answer

it's possible ?

You can use {ASSESSMENT_CURRENT_TOTAL} to display a running total at the end of the groups.

You will need to use JavaScript and {INSERTANS} to display the wrong questions from previous pages.

sorry i don't know java
there are other ways ?

For an easier solution you have to put the overview page into the next group, because previous answers have to be saved once before the INSERTANS placeholders can be used.
You can simply hardcode the answer overview: Create a table with columns "your answer" / "correct answer", fill the correct answers manually and use the INSERTANS placeholder to show the users answers.

Yeah, that's a good solution to display all of the previous answers, my solution was to only display the wrong answers.

i'm studing...thanks
the best solution for my problem is give advice related at the wrong answer
for example
i have an environment checklist for the schools
if in a group of question related to the topic water the school give a lack answer about using of water i should give an advise about change taps

limesurvey have a simple solution for this request ?

You can create a boilerplate question with some hints like "The answer you gave was wrong..." and set a condition to display this hint if the user fgave the wrong answer.