Hello thanks for asking I can understand your problem. Such type of anxiety is common in students before exams. This is also called as performance anxiety. In most of individuals psychological counselling and relaxation exercises help to keep individuals relaxed and improve performance in anxiety. Some times due to severe anxiety performance decline occurs and which should be treated by medicines. In such type of anxiety medicines like low dose non-sedating benzodiazepines like etizolam or beta blockers as propranolol can be used. Propranolol is a drug that reduces symptoms and is commonly prescribed in situations of performance anxiety. Consult a psychiatrist for treatment. Hope this helps you. Thanks