Memory is very fragile. Your ability to create and recall memories is related to variety of factors including nutrition and sleep.

• Cortisol could be one reason too. It is the hormone body releases during stress. This is known to interfere with the process of forming and recalling memories. When we are in stress cortisol increases in our body. This can lead to forgetfulness. Memory loss can disrupt your day to day life and compound distress caused by stress and anxiety. Reach a therapist who can help you out with this as they could conduct series of test to understand your episodes of forgetfulness.

• Test anxiety also you could be one more reason you cant remember. you may feel anxious while entering the exam room. it is important you calm your mind and breathe in, out for 5 min to relax yourself before the exams.
• Lack of revision
• Lack of confidence

There are few ways you can try next time to prepare for the exams. Do not get disheartened.

• Train your brain:

memory and brain games like Sudoku, scrabble, crosswords, word puzzles or chess can help boost memory and brain function. Playing these games wont just exercise your brain but also help you with your anxiety. if games don't appeal you then strengthen your brain and improve memory by :

• Learning a new language. There are various free apps and sites where you can learn.

Learning a musical instrument or playing if you know any musical instrument.

Learn a new skills like gardening or art or painting etc. you need to train your brain to learn.

• Maintain journal:

Every day write down your worries and potential causes behind it which can help you express them so they don't take up so much mental energy. When you have less to worry about your memory might improve automatically.

• Make time for exercise as physical activity can improve your mood and boost overall brain health.

• Focus on one thing at time. Multitasking spoils all the tasks because the brain can do only one thing at time for some. so break down your chapters. now in a chart write what will you study for today and see end of the day you complete it. only focus on studying important parts than reading completely.

• Read for 20 min then take a break for 5-10 min. taking breaks helps reduce fatigue and increases focus. choose a regular time of the day when you are most alert for focused work and for remembering.

• keep your room organised and don't keep any device near you which is distracting e.g electronic devices like phone, laptop etc

• 30 min of exercise like yoga or tai-chi or aerboics 4-5 times a week would improve your focus and executive functioning skills

• Research has shown that you remember more when you review/ revise what you studied or learnt earlier in the day 10 to 15 min before the bed. Reviewing what you studied allows you to process the information as you sleep. Try revising atleast 2-3 times a week and make a short notes so you remember those key points.

• Highlight important text with different coloured pens will help you to focus and study only things which are important.

• Recording few notes which you know is very important. keep listening to those when you are walking around

• Try reading an assignment aloud to yourself. keep repeating it till you understand the concept.

• You can also try different places to study to help you remember like different rooms or hall or outside in the garden. experiment and see what works best for you. you also can explore do you need to be on your own or study with another friend, do you prefer reading in silence or need background noise to prepare for exams.

• It is also important that you pay attention to what you read. if not recalling gets difficult.

• Everyone has different ways to remember. now you need to introspect what is your learning style. For memorising you can make it fun by creating a song. This would make information memorable. example just to remember planets sing this statement in form of song "My very excellent mother just served us noodles" first letter of each word is starting letter of planets so start associating words. Like that anything important you need to remember connect it with a song or your memories like friends name or incident in your life. This way of associating your important notes with a song or important event recalling gets easier. Certain people remember it visually so they draw diagrams to recall with different colours just to associate the unit with a colour or diagram,

• Ask your friend or parents to help you. You could take a mock test and they would just check that you complete on time like how do it in the exam. Practising before the actual exam will help you handle the test anxiety too.

• You can even share what you learnt with your friend or family. This will help your mind to retain the information much longer. You can teach other friend the unit which will help you to remember it.

Don't get disheartened and try these techniques. It will surely help you. Just believe in you and give your exam once again with full determination to do it.