I'm trying to create a sequence of 

admission_code field

but the error occurs  this is the error:
result=super(School,self).create(vals_list)
NameError: name 'School' is not defined

I don't understand what should i insert inside super

this is the code of the function:

@api.model
def create(self,vals_list):
    if vals_list.get('admission_code','New')=='New':
        vals_list['admission_code']=self.env['ir.sequence'].next_by_code('school.student.sequence') or 'New'
        result=super(School,self).create(vals_list)
        return result

and this is the code of sequence.xml file:

    noupdate="0">
    model="ir.sequence" id="school_sequence">
        name="name">School Sequence
        name="code">school.student.sequence
        name="padding">5
        name="company_id" eval="False"/>