buddy, we shouldn't be concerned about it at all for three reasons:-
1) No way we can differentiate whether a question is an actual one or experimental.
2) While trying to differentiate between an actual and an experimental one, you will end up wasting valuable time ,energy, and focus, resulting in drop in valuable points.
3) lets suppose even by applying ur guess power , u come to d conclusion that its a experimental question but still will u take a chance by guessing it and not working on it.Probably not.
So let's focus all on the questions one by one without any distractions .