Thank you for sharing this burden for your wife. It is a beautiful thing to see a husband who loves his wife, prays for her, and wants to see her strengthened. Scripture describes a wife who loves the Lord as a great blessing and gift, and it calls a man to rejoice in the wife of his youth and to cherish that covenant relationship. Your prayer reflects that kind of love and care.
The best help for focus is to keep the heart centered on the Lord. When the focus of life is on Him and His kingdom and His righteousness is sought first, He brings order to everything else. Pray that she will keep her mind and heart fixed on Christ through her studies, that she will look to Him for wisdom, clarity, and strength each day, and that He will guard her from distraction and anxiety.
School is an opportunity entrusted by God to learn and to grow, and it is wise to make full use of it. Many people look back and wish they had valued their education more and not wasted the time they were given. Encourage her to see this season as stewardship, to be diligent, to apply herself wholeheartedly as unto the Lord, and to receive what He wants to teach her both in knowledge and in character.
There are also times when we must simply wait upon God and learn patience. Tribulation produces patience as we learn to trust Him with outcomes rather than living in tension and worry. You can pray that she will not be overwhelmed by pressure, but will rest in the Lord, trust Him with results, and experience His peace as she does her part faithfully.
May the Lord bless you both in this season. I pray that God will give your wife a clear mind, steady focus, and a peaceful heart, that He will help her to understand what she studies and to remember it well, that He will keep her close to Himself and strengthen your marriage as you support one another, and that all of her work will be done for His glory. May He sustain her with energy, protect her from discouragement, and let her see the fruit of faithful diligence. In Jesus name, Amen.