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If you are playing middle school and are hled back there is no restrictions.
As far as I know the limitations for high school eligibilty is 4 years starting your freshman year plus one year for every grade below, so if you are an 8th grader and you play Varisty basketball and are held back,,, you can not play the next year and still be inthe 8th grade, you will have 4 years of playing time once you hit the 9th grade?????

I think this is correct??????

You cannot play 2 years in the same grade.

8th grader does not play varsity/freshman/jv his 1st year in 8th grade and is held back, can play 2nd year or vice versa.

Yes, 4 years once in 9th grade,