Orthodox believer man for trying to turn to God. No exception request for study help. Himself the student can turn to the Lord, as well as relatives and friends of the student are able to make prayers for the needy man. If there is no prayer, we can cry out to God in your own words. There is also a specific prayer for God's help in your studies and before beginning the educational process.
In the Christian tradition, particularly common supplications of the study help to the most Holy Theotokos. You can order the prayer of the Mother of God before her icon "Addition of mind". The prayer books also contain prayers to the virgin Mary in front of this miraculous icon.
Among the saints that are accessed for help in the study, we can distinguish the Holy prophet Nahum. The people even there is a saying that the prophet Nahum instruct to mind.
Often prayers for help in learning turn to the Apostle and Evangelist John the theologian. This Saint known for his special theological vision of Christ's teachings, as evidenced by the written gospel and several Epistles of the Cathedral.
St. Sergius of Radonezh is also known as a Saint who has a special grace to help in studies.
It should be noted that it is not enough just to address prayers to God or saints for help in the study. The student himself should try to gain knowledge and progress in the acquisition of the latter. It is the action of human free will aimed at acquisition of knowledge, together with prayer and can bring a person the desired result.