See link below for details.
http://www.cimaglobal.com/Study-with-us/Register-as-a-student/Fees-and-payment/Resignation/
If you resign as a cima member you do not need to submit practical experience again. you simply pay reregistration and other outstanding fees.
If you are a student then resigning will not affect your experience. It is seperate from your cima subscription. If you have 3 years experience then whether you are registered with cima is irrelevant.
Im not sure from your post but it sounds like you may mean that you have passed the exams but not submitted experience yet? Appologies if i have misunderstood
