Thanks for your comment. I have heard such reasons and it could be true. However, one cannot be sure unless one is close to the decision making circles in this front. But my guess is that such policies will not achieve their objectives of "managing the youth". In fact I argue they have the opposite effects. I mean, by over-educating the youth the government has in fact created more dissatisfaction among the youth as these "educated" youth will now have higher expectations which the government and the economy cannot meet. So, there is a good reason why higher education may not be used as a short-term tool to "manage the youth" as it is exactly doing the opposite.
The military service, however, is a totally different subject and there are many calls inside Iran to abolish it or shorten it as it is taking a non-trivial toll on government's budget and economy as a whole.