Assign gamipress points for a gravity form based on users first submission

I’m using GamiPress with Gravity Forms and want users to submit a quiz once and only get awarded points for the first set of answers. I tried to limit form entries on the Gravity quiz form but this limit applies to the total number of entries of this form submitted and does not limit the number of times a specific user submits the form. In order to allow everyone to enter, I have had to set no limit on the number of entries for the form.
Instead, in the Points Type, I am using the event ‘Submit a specific field value on a specific form’ with the form name and field, and value expected. All of this is working. The only issue I have is that people can enter multiple times until they get all questions right, which eventually allocates all available points to their tally.
1) How do I limit points allocation to the first submission of the form?
2) Can someone explain the difference between the options in the point type event ‘Submit a specific field value on a specific form’:
i) <select value> time(s) limited to <select value>
ii) …with a maximum number of times to earn it of <select value>
Thank you!