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This week Mamita Gurung, 16
Mamita asks: As the HKCEE approaches,  what can I eat  and do to make sure my brain is at its sharpest?
Wynnie says:  In between studying  and  sleeping, you may feel you don't have enough time to  eat properly -  all your spare time is needed to cram information into your brain.
However,  what you eat  is never  more important for boosting brain power as  it is during revision time.
Nutritionists believe  the best way to improve test scores is  to eat well every day -  that includes eating  a balanced diet with at least seven servings of fruit and vegetables a day.
Many scientific studies  show that children who don't eat breakfast perform poorly  at school - their attention spans are shorter and they achieve lower test scores than those who eat breakfast.
According to the Chinese University of Hong Kong, skipping breakfast  has been linked with  tiredness,  obesity and poor school performance.
But what you eat matters: according to research published in 2003,  students who have fizzy drinks and sugary snacks for breakfast performed at the level of a 70-year-old in tests of memory and attention.
Research from the University of Ulster in the UK found that eating toast alone boosted  scores  in a variety of tests.
But when the tests got harder,  a breakfast of toast and beans worked best.
High-fibre foods like beans are digested slowly,  providing a slow and steady supply of energy.  Sugary snacks  are broken down quickly, providing a burst of energy.
Oily fish, such as salmon, mackerel and sardines,  contains nutrients which help to improve memory as well as brain development.
Eggs and nuts contain a substance which  creates new memory cells.
Fruits and vegetables are packed with vitamins and minerals which help  protect our immune system.  This keeps us healthy,  which is especially important during exam time.
Scientists have also found that eating more blue or purple and red-coloured fruits and vegetables, such as blueberries, raisins, eggplants, figs, plums, red apples, tomatoes, red peppers, strawberries and watermelon, can help boost memory function.
Most of us don't drink enough water. Water is important because dehydration can affect concentration.
Dehydration makes you  irritable, restless and lacking in energy. It also makes you think you're hungry,   making you snack on  unhealthy food.
Studying  doesn't give you an excuse to sit around all day.  Studies have shown that simply walking for half an hour, three times a week can improve your ability to learn and concentrate by 15 per cent.
Mamita's diary
Breakfast: Bread; Horlicks
Snack: Chips
Lunch: Cup noodles or pizza; water
Snack: Bread, chips or fruit
Dinner: Rice with vegetables and chicken wings or pork chops; water
Exercise: Dance practice three times a week and jogging every evening



What to eat during exams