Is this true or not?

It depends on whether you or the driving school made an appointment for you. If you make an appointment for the exam yourself, then this is the real information.

If you don't have an appointment yourself, it is very likely that someone else's mobile phone number is wrong, so you don't need to pay attention.

If you are sure that you or the driving school have an appointment for the exam, then you must take the corresponding exam at the normal time. Good luck!