How to save peoples times and compare them?

i am creating a race car game in advanced vehicle

i was wondering how do i save their lap time ( time to get around lap) and create a best time so it shows up the next time someone plays the game

please help im doing this for a major project at school and its due in a month

You mean you want to save information?
https://docs.unrealengine.com/latest/INT/Gameplay/SaveGame/Blueprints/

On your character BP create a float variable called start time.
On the event begin play, right click the event graph and find get game time in seconds and set your float start time to this.
I guess next you would need a overlap event to trigger once you compete the lap and in this event you need to get game time in seconds again and store that to a new float called end time.

Simple macro to do float - float. End time minus start time = time to complete race.

Hope that helps!