Database Table Modification + PHP Script

We are looking for an experienced developer for the following 3 tasks: 1. Modify existing db table structure to ensure that a user can create multiple quizzes and quiz_id & teacher_id is stored. Currently each user can just create 1 quiz. 2. Create a basic PHP script to allow an existing user to login. 3. Basic verification to ensure that existing word entered in 1 field doesnt exist in the database, no duplicates Budget: $10-$25 Freelancer should be able to start work immediately