I recently came to US on a valid H1B for location A. Last week my employed filed for a H1B amendment petition due to change of location I have been admitted to a prestigious masters program and I want to change my status from H1B to F1. My course starts on 1st Aug 2017. I am worried about last action rule by USCIS. My questions are a) After I terminate my employment with the current employer, isn't the employer legally obliged to withdraw the amendment petition and inform USCIS Ib) In case the employer does not withdraw amendment petition, and if H1B amendment is approved after COS, will it have any affect on my COS. Will my COS be revoked ? Appreciate any help in this regard.