Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh.

It might be just a medical condition that you need treatment for better focus and physicians can help you in that.

You also need to consult experts on educational methods of learning and studying to make best of your way of studying and the effort you put on it.

Of course, the power of faith and the healing in the Qur’an recitation and making du`aa is always a powerful tool to lift our spirits up and give us self-confidence to perform better insha’ Allah.