Modify variables managed by storyline

Hello Andrew I tried something like this, I added a scene with additional slides and if the answer is good we change the scene and we come across a complementary slide. but when you return to the random questions slide it no longer works. if I refer to the question slide why? I'm afraid that in the random generation this question will come out without the previous question. we can therefore find ourselves in a comic style of question such as: what is the difference between a pigeon, which can be disorienting for the trainee.