Creating an app to prepare for Salesforce certification! Is it worth it?

Hey! I’ve been into Salesforce since the beginning of my carrier and I’ve recently trying to create something own my own like an app to freelance/hobby.

So, the app is all about training you for your Salesforce certification and it’s divided into 4 sections to help you prepare for a given certification.

The practice section is where you answer the questions on your app and it gives out the answers for that question.

The main benefit is that the questions which you haven’t answered right repeatedly gets shown for you to remember it.

Do you think something like this would be useful for fellow Salesforce customers?

Currently in the demo I have only worked on administrative certification!

Any inputs would be appreciated!