Some members will start off with a lot of energy and will lose enthusiasm as they end up doing an unfair portion of the work. They will then proceed to demand that the other members do the rest of the project. The other members will then cry that they were not given enough time. This brings up the other headache of projects, group members that do not have the same priorities as you do. Other members of your group will rarely want to put in the amount of effort into the class as you do.
Some common advice is to talk to members who are doing less than their fair share of work.
But usually, the members who are not doing their part do have other priorities, and no matter how much you talk to them, their upcoming exam is a more immediate concern to them than the project, which the other group members would probably finish anyway. The first step towards handling this scenario would be to figure out how much importance you should place on the project. There comes a point when leaving a project unfinished is better academically than sacrificing your study time for important exams in other courses. If you find that the project has tremendous significance, then effective planning is the key to limiting the risk of the less than sufficient effort of your fellow group members. Take the previous radio controlled car example.