You can follow the AFCL guide... but if not, you may have chosen some specific interactions/choices that led to you having only 24, for example, some times you have to choose different choices that make you lose or not gain any points in the moment just so you can gain even more later. Also, if you failed some quick time events or didn't know about the choices that work with a probability (or something like that) you can end up with less points.