yes

My hu*****and used 11 months CPT and 12 months OPT starting from the end of 1998. At the time he was told as long as CPT not longer than 11 months, he could get full OPT. And it is true to apply CPT in your school and at the same time register course (not graduate yet), you can have a choice of 1 credit hour a term for only once, for other terms 3 credit hours. And during CPT and OPT, no need pay some certain kinds of taxes. But I heard some schools even don't offer CPT. Check with your school!