You don't say how old you are, so I don't know if you are in high school or college or what. Assuming you are a normal teenager who does not have ADHD or Asperger's Syndrome or anything else that would make it hard to study, there are a couple of things you could try.
Work in a quiet area with no distractions.
Do your studying relatively soon after you get home. The later you wait, the harder it becomes to study.
Have a list of what needs to be studied that day. Do you have a test? Are you writing a paper? Get prepared in advance with whatever books or reference materials you will need.
Sharpen your pencil, get a drink and/or snack. Go to the bathroom. Turn off your phone. Do everything you can possibly think of in advance so you will not need to get up again while studying. We all like to make excuses for not studying :)
If you have done all this but the problem is that you really can't concentrate, try to find a classmate you can study with. Take turns pretending that you are teaching him, and he is teaching you. Just reiterating what you've read, and putting it into your own words helps cement the concept of what you're studying. If you can't find a study buddy, make one up. Pretend (quietly, so no one thinks you're insane) that you are teaching someone who knows nothing about your subject.
If it's a particularly dull subject, see if there is some way you can relate your lessons to real life. Are you studying biology? Heredity and genes, for example? Check the eye colors or blood types of family members, and see if they fit the expected patterns taught in your textbook.
Are you studying history? Try not thinking about dates and events separately. Try to see how they fit together. Can't remember the year when Washington was president? Well what else was going on roughly at that time? The Revolutionary War, the Declaration of Independence. So he couldn't have been president in 1620. Or 1860. It had to be after 1776, right?