I have slept with my head close to mobile phone over many years and now i forget answers during my exam. during childhood, i was brilliant in rote learning. could this radiation exposure be the cause of weak memory now ? what should i do?

Unlikely: There are no studies showing that cell phone radiation affects memory. Common causes of impaired memory at your age include excess alcohol use prescription medication illicit drug use depression and anxiety

See you doc.: Your trouble with your memory may not be related to phone contact. However, effects of cell phones are still not clear but precautions should be taken. Do not sleep on your cell phone! See your doc to check for other things that could affect your memory, like thyroid hormone problems. Do not drink alcohol or use any drugs, including marijuana. See this study: https://tinyurl.com/y2zx8lmu