For testing you need to do two things.
The first is to have a reference setup. This is a setup on which you have a known performance.
Set your kart to the reference and drive your reference laps. You can compare these to other days that you have driven on this reference setup, because things like the amount of rubber on the track can make a difference.
Ypou can also revert to the reference set at any time during the day. Why? Because that oft made claim by a driving school that they will improve your times by half a second a lap over the day is absolutely true. Almost everyone will do faster laps as the day goes on, the track rubbers up and gets warm and so on. Unless you test against the reference set you won't know whether its changes or the day that are making the difference.
The other thing is to only change one thing at a time, but have some idea which things are interconnected. For example, one thing we often hear is that to improve 'not enough grip on the front' the answer isn't to get more grip at the front, but may be to get less grip at the back.
Another good idea is to set up conditions that you know are wrong, so that you can see what 'wrong' feels like.
And if you are a novice, then do it with someone who has some idea of what is right.
Don't keep testing umtil you are tired. Driver condition is just as much a performance factor as good tyres.
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