Please, I need help. After creating my custom module which I have been able to install successfully, my module fails to appear in the group. I enabled developer mode, and I guess I have a correct code. Not sure what's happening. 

here is the content

model="ir.module.category" id="school_management_access">
    name="name">School Management
    name="sequence">10


id="school_management_student" model="res.groups">
    name="name">Student
    name="category_id" ref="school_management_access"/>