A positive Rahu can help in civil services, politics, and engineering, to name a few. A negative Rahu creates illusions in the mind, which may make a person give excuses for everything that they may be asked to do. However, Rahu also intensifies energy, so if one works hard, then it will give even more energy to keep one going.
This energy is unbridled and can even take one to the dark side - towards negativity (criminal mindset, gambler, etc.). If one is going under the dasha or mahadasha of Rahu; or Rahu is in the 1st, 4th, 7th or 10th house in the kundali chart and one is able to get some Guru in their life, then it can take one to great heights. So Rahu + Jupiter = great achievements.
Even if one does not have a guru, it's important to be inspired by one, so perhaps putting a poster of the one that someone idolizes can greatly help them succeed in life. If a child is greatly under the influence of Rahu, and not listening to anyone, then it's important for them to do a lot of sports; give them something that they will be allowed to break (if it's an adult - give them something like a motorcycle).
