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Children’s endeavor and growth are valuable just like their success and it is not only successes that are scored, but also efforts and progress [are also scored].
Is it correct to omit the the last part inside brackets, given the fact that the verb "scored" is already used in the sentence?
Yes it is correct - and reads much more naturally.
I would put a comma after the first "success" like this, and insert "their" as suggested by @user3169:
Children’s endeavor and growth are valuable just like their success, and it is not only successes that are scored, but also their efforts and progress.
Note that the use of the word "endeavor" here is quite correct, but it is unusual.
