If you are taking various entrance exams like medical and engineering, then the student should offer prayers to Goddess Brahmacharini and chant her special mantra as per Hindu religion. Goddess Brahmacharini is a form of Mother Goddess Durga (Shakti) and she is associated with learning. This is a kind form of Mother Goddess Shakti in Hinduism.
Mantra for Success in Entrance Exam
ब्रीं ब्रह्मवादिन्यै नमः
Brhim Brahmavadineye Namah
Brhim Brahmavadineye Namah
How to Chant the Mantra?
Wake up early in the morning before sunrise.
Take bath.
Wear white color dress.
Offer prayers to Ganesha in mind.
Light a lamp using cow ghee.
Mediate for few minutes.
Chant the mantra 108 times - you can keep the count using a chandan mala.