Concentration is incredibly important for retaining your memory.You need to keep things simple. This is why you enter a room and forget why you came in. It's because you were probably planning your party at the same time, or thinking about the TV episode that you just watched and you weren't concentrating. When you're studying and trying to remember things for school, then focus on that one task.Don't think about that friend's party from the weekend. Don't try to do a bunch of different tasks at the same time, or you won't get the full benefit from any of them. Get away from your typical surroundings that make demands on your time, when you need to study. This means leaving your house, your family, your friends, your pets, your TV while you're studying. Find a specific place to study and don't do other things while you're there (like pay your bills, do leisure activities, etc.). Make sure that you only study when you're in that place, as it will help your brain get into the studying mode. Choose an area that has good ventilation and light so that you are more likely to stay awake and not get distracted. If you do find that you can't work and that you're not retaining anything, take a short break (not too long and don't do anything that will start consuming your time like going on the internet). Go for a short walk, or get a drink. Sometimes the distractions don't come from your friends or family, but come from your own brain. Often when you're reading something for school you find that your brain hasn't been on the material, but instead has been thinking about that party you're going to or wondering whether you've paid your electricity bill. Keep a specific notebook for these distracting thoughts. If it's a thought that requires later attention (like paying your electricity bill), jot that thought down and dismiss it from your mind so you can work. Make the distraction a reward. Tell yourself that once you have finished reading (and understanding and remembering) this next section, you'll take a break to deal with the thoughts, or daydreams. Studies have shown that the time of day correlates strongly to how well people remember things when they're studying. Even if you think of yourself as a morning person or a night person, try to do the most important of your studying in the afternoon. You'll recall the information better. If you're reading something that you need to remember, write a short summary of each paragraph in the margins. Writing things over again not only helps keep things in your memory better, but it will also serve as a memory jog when you're looking over your notes and readings for that test (or even for class). Write down the main points from each things you're reading, so that you can jog your memory when you need to and to show that you read and comprehended what you were reading/studying. Writing things down a bunch of times helps cement things in your memory, especially those peskier ones like dates and vocabulary words for foreign languages. The more you write them down the more they'll stick in your brain.
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One-sentence summary -- Don't multitask. Avoid external distractions. Avoid internal distractions. Study in the afternoon. Summarize each paragraph in the margins. Write things over and over.

Fill the bucket three quarters of the way full with warm water, then add half a cup of ammonia. The ammonia will help loosen stuck-on dirt and stains, allowing them to be scrubbed away with ease. Be sure to take the proper safety precautions when working with ammonia. Pull on a pair of rubber dish gloves and a facemask to protect you from harsh fumes. Use the brush head to stir the solution and soak the bristles in preparation for scrubbing. Shake off the excess solution into the bucket. Pick a brush with natural or synthetic bristles. Wire brushes can cause scratches when used on brick or leave behind small flakes of metal that will eventually rust. Ammonia gives off noxious vapors, so stand clear of the bucket while mixing and dipping. Run the brush across the surface of the wall using short, forceful motions to break down stubborn residue and discoloration. Make sure you scrub the entire wall to prevent any one section from come out with a different degree of coloration. Continue scrubbing until the wall is completely clean, adding fresh solution to the brush every so often. If you're having difficulty removing dirt, try scrubbing the spot from different angles. You'll need to apply quite a bit of pressure to penetrate into the cracks and crevices of the brick. Hose off the brick to rinse away all traces of the ammonia solution, along with whatever debris it helped dissolve. Let the wall drip dry. Try to get in the habit of scrubbing exterior walls with ammonia once or twice a year, or more frequently if you live in an area with a lot of dust or rainfall. If you have a power washer or a hose with a separate pressure nozzle, you can use it on a low pressure setting to knock out dirt that has settled down deep. Ammonia may damage the brick if left to soak into the wall.
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One-sentence summary -- Combine water and ammonia in a large bucket. Dip a long-handled brush in the ammonia solution. Scour the dirty areas of the wall. Spray the wall with clean water.

You will need to find a site that is vulnerable, due to an easily accessible admin login. Try searching on your favorite search engine for admin login.asp or admin login.php. Type admin as the username and use one of a number of different strings as the password. These can be any one of a number of different strings but a common example is 1'or'1'='1 or 2'='2. This is probably going to require a little trial and error. Eventually, you should be able to find a string that allows you admin access to a website, assuming the website is vulnerable to attack. Then, logged in as an administrator, you can perform further actions, such as uploading a web shell to gain server-side access if you can perform a file upload.
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One-sentence summary --
Find a vulnerable site. Login as an admin. Be patient. Access the website.