I presume that by "how would I get the student credit of €10.99" you mean "how can I avail of the student offer"?
By signing up for the student offer - see here:
If you are already a 48 user and want to switch to the student offer then you'll probably have to contact 48 support to ask if they can facilitate that.
Several people have asked about this but neither 48 support nor the 48 website has clarified whether or not this is possible and, if it is, how the change is effected.
To contact 48 support see the links in my signature below.
