Hi Richard, What your co-worker told you is correct. Service members who qualified for the Montgomery GI Bill and also the Post 9/11 GI Bill are eligible to receive up to a total of 48 months of benefits from the two GI Bill programs. That means that if you are eligible for the Post 9/11 GI Bill, then you do indeed have another 12 months of education benefits that you may use. Go to the VONAPP website, and register for the Post 9/11 GI Bill, and you should receive a Certificate of Eligibility if you are eligible for the benefits.
Take that Certificate to the Registrar’s office at the graduate school you plan on attending, and they should fill out the paperwork, and submit it to the VA. If you pick a school that is a member of the Yellow Ribbon Program, and the school selects you for the program, you may have most or all of your graduate school tuition covered for 12 months.
The Post 9/11 GI Bill is different than the Montgomery GI Bill, the tuition will be sent directly to the school, and you will receive a check for any housing or book allowances you may be eligible for.