Can I through XLS format develop a formula to let KOBO automatically calculate the scores of each respondent for each item and collectively through the hole survey respondents ? if so , how to do that?
Yes, you can calculate scores automatically in KoboToolbox. I suggest doing this with an XLSForm.
Please take a look at the documentation here
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@Ahmed.Seliem, this community post discussed previously should help you solve your issue:

