My H1B Extension has been filed with California Service Center and my current petition status says “Case received on November 30th 2018”. As my extension case in still in review by USCIS and is nearing 240 days soon, I’m little concerned about situation as I had a site visit from USCIS. Few of my friends are suggesting me to apply for schools. I am thinking to upgrade my petition to get processed under premium. Could you please provide me recommendation.
I suggest you to go for premium processing. You will get results in two week.
As @sms has pointed out above, upgrade to premium. I didnt see any reason what are you waiting for while your 240 days threshold is nearing you.