Whether you keep written records or electronic records, you must keep records. You need to keep track of every telephone call and every message sent. You also need to keep track of every response that you receive.
Keep all of the information that you collect on every company you research or come into contact with. Especially keep track of which resume you have sent. Keep track of who you have sent them to and why you sent it. Keep track of which resume you have posted on which job board or company websites.
Keep track of every chance encounter you have had where you have discussed your qualifications. Keep track of every interview and every thank you note that you have sent.
Keep track of everything related to your job search. Keep organized, manage your time.

