Job32:8 But there is a spirit within people, the breath of the Almighty within them, that makes them intelligent. NLT
I read the story of a Christian brother that was invited for a job interview in a telecommunications company. He was directed by the Spirit to get a marker and a board to explain certain things to the panel. He answered his questions intelligently as he was enabled by the Spirit of God. He got the job because the panel members were amazed at his intelligence.
The Spirit of God within a believer can make a believer look so intelligent if such a believer submits to him. The spirit of God in Joseph made him to interpret Pharoah's dreams and propose the solution to the famine that was to come in his days. Joseph was the first man to use compound interest to save a nation from food crisis.
The intelligence given by the Spirit comes in form of a revelation or inspiration in solving problems. If you are about to go for an interview or you want to write an exam, after you've done your part of the deal by studying, spend sometime praying in tongues. As you pray in tongues, you position your spirit-man to receive revelations from God on what to write, do or say. That's the advantage we have above ordinary men.
Spend sometime speaking in tongues, at least 30minutes to stir the Spirit within you.