I would suggest for memory problems you check out this link:

best fish oil

There you will find clinically researched data concerning your query. Being a teacher I am sure you know that brain exercise will always be beneficial, however the brain is also a fatty organ which requires dha fatty acid which is found abundantly in fatty fish. The down side is the contaminants found in such fish. Hence the most purified fish oil is essential for getting the greatest health benefits for your mind.

You might also want to research a software program called ‘Eye Q’ which helps in the processing of information for children and adults. Once you have read the clinical data at the above link, I think you will readily conclude that both are essentail options. But do remember that programs like ‘Eye Q’ can not make up for deficiency of good fats in your diet.