Below requirement need to be build using Drupal Quiz, Certificate, Paypal and Rule modules
1. User can take (After Signup) the quiz and result of pass or failure need to conveyed at end of the quiz -> Drupal Quiz Module
2. User shoud be able to download the Certiciate and Logo once he pay the fees through the PaypalGateway -> Drupal Certificate, Paypal & Rule Modules
Let me know your best bit for above requirement
Please provide lower bid as its startup company.
Skills required: Drupal