There are no limits at the moment prop 215 was found to be guidlines not strict limits. That doesnt mean you can grow 500 plants though just be smart keep it low as you can although it sounds like your doing a SOG set up with tables but w.e. Yes the school would be a problem if you were caught it would create MMS (Mandatory minimum sentence) on a federal level atleast.

Less than 50 kg felony 5 years $250,000
50 to 100 kg felony 20 years $1,000,000
100 to 1,000 kg felony 5 - 40 years $2,000,000
1000 kg or more felony 10 years - life $4,000,000
To a minor felony double penalty double penalty
Within 1,000 feet of a school felony double penalty double penalty