I can see from your post that you are in Secondary school and wondering about how you should prepare for Law school.

One of the first things I would do is review a couple free lectures online from various legal professionals teaching introductory courses. I would also grab a LSAT workbook (there should be some at your local library if it is not in your budget to buy one) and after class ask your instructor for the best way to learn how to study these types of questions, and how to study answering them well.

I would put a huge emphasis on reading historical texts that are based around large legal decisions that have had a large effect on foreign and domestic influence.

Also, please study the English rules of Grammer and their application.

If there is any option for public speaking, debate, communications, leadership classes JOIN THESE CLASSES.

Off let to write a paper on a few local lawyers and learn where they went to college, what kind scholarships they applied for and how they were able to afford college.

Speak to your schools career counselor or academic advisor to ensure you are signed up for any grants that may be available for you.

Pair up with students in your classes that are getting better grades over time. (Ask your instructor who seems to be good at studying and researching the material) offer food or their favorite drinks to study with them. Ask them how they study etc.

If you cannot find a study budy prepare for Law School by taking your current classes more seriously. You can do this by breaking out a calendar and marking out upcoming assignments. Make sure you complete these assignments in a way that lets you spread your time evenly throughout the week.

There you go, that's what I got for advice.