That is normal UP to some degree. If you can't concentrate on a certain task given ( say do problems 1-10 for example) and you find you just can't complete it without getting up for a drink, going to do this and that, you may have Attention Deficit Disorder. BUT is you can complete these tasks but just find your interest is low or on something that happened the day before, then its normal. I would try these techniques:
1. Try a cup of java! Yes, its been researched that concentration and tests scores go up when you drink a cup of coffee/latte.
2. Get enough exercise. This is a cure all to all types of issues.
3. DIET! Yes I said this with all caps! Your diet can determine several physical and mental issues you are having. Try adding more veggies in your daily meals. Instead of grabbing chips at break, go for the carrots and dip you snuck in your purse!
Finally, let's face it, school can be boring at times, but thats when YOU come in and make your study time creative! So try this:
Find a special space in your home. This could be a room, a corner, den, whereever. Now decorate that area in your own personal study place. Get some paper out and design it! You can even go as far as painting the room if your parents let you. Bright green and yellow are great colors for attention. Avoid blues and purples as they may make you want to sleep. You want to make sure you have plenty of light! Gather some cool pens and pencils and start to work :D
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