Improve Model Structure

[ArpitSureka]

• Add validators on phone no. email id, roll no(9 digits) etc.
• add required true on which fields are compulsory
• change to the foreign key which keys have a relation with other keys.
• make primary keys primary, text to big text, etc.

[ahmadsyafrudin]

can I working on this @ArpitSureka ?

[ArpitSureka]

@ahmadsyafrudin already completed