I will bold this so others can see
The rule is to submit as much as possible between the shown range. The target is secret and will be revealed only after the submissions are closed for each stage. What we have provided for you is the range (so the target score for current stage is between 300-340 points for example, it might be 301 or 315 or whatever, we will reveal that at end of the stage). If you hit the target you get a point. So if you submit 2 scores only for a stage and range is for 40 points difference, you have a 2/40 chance of hitting the target score. Therefore, all the subs matter for each stage.
I have preset all the ranges and targets before competition started if you were wondering.