there is one information that can be inserted only by me, which is the participant score
Is that score calculated?
In this behavioral study?
Why not include it in the redirect link?
Or do you have to calculate it manually?
The other way, you edit the entries of the participant.
We had exactly this question here about a week ago.
Have a question of type "short text" or whatever you think to need at the end of the survey.
Hide it by relevance.
So you may edit the data of this participant later and have a free field to enter your score.
Joffm