Not sure what GSM is. Im hoping to make it through November the Moleskine XL dotted. I’ve been using it since April and I’d probably be OK if I hadn’t taken so many notes. https://www.amazon.com/Moleskine-Ruled-Notebook-7-5X10-Classic/dp/B015NG44CU/ref=mp_s_a_1_6?dchild=1&keywords=moleskine&qid=1604013041&sprefix=moleaki&sr=8-6&th=1&psc=1