Refinement of the functionality of the beck written in laravel voyager

We have a working rest api (I will send a collection to the candidate). You need to fix the method for sending feedback to the mail.
There is a test within the application. The result of the test is a set of books from the database. To obtain the test result, there is a special method. You need to add an additional parameter to it - age.
Each book has a recommended age (6 , 12 , 16 ...). you need to filter the books that you send by the age that comes in the request and the age that is specified in the workbook