Am working under H1(expires on April 2020), I got admission in an university which offers Day1 CPT(class begin Jan-20). And am applying for COS (H1 to F1) when shall i apply for CPT, should i wait for COSapproval to opt for CPT? any suggestion to cont. my work w/o break? Is it legal to work until i get COS approval? And once its approved, can i remain working by requesting CPT?