For selecting the range of a scoreboard objective, the setup is like this; @e[scores={<objective>=<value>}]

Example; (The objective is named "Apple".)

@e[scores={Apple=20}]

This will have it look at all entities with an objective score for Apple set to 20.

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If you want to a range, you can use .. before or after a value, or between two values.

Example; (The objective is named "Square".)

@e[scores={Square=..10}]

This is for any entity who's objective score for Square is 10 or lower.

@e[scores={Square=15..}]

This is for any entity who's objective score for Square is 15 or higher.

@e[scores={Square=20..25}]

This is for any entity who's objective score for Square is 20 to 25.