I am STEM OPT expiring in Feb2018 and working for A - H1b picked from B but RFE Can I continue with A till H1b approval

Working with Company A on STEM OPT which expires in FEB 2018

H1b picked from Company B but RFE for LCA on Aug 21

Attorney of Company B in the process of filing response to RFE

My doubt is can I continue working with Company A on STEM opt till my H1b is approved as my School has sent me a mail saying that from Oct 1 ur OPT is changed to H1b

Should I intimate my School of the receipt of RFE and allow to continue on STEM OPT till RFE is cleared

Please reply urgently as I have to decide

Thanks in advance