I agree with Natalie's answer and would add the following: English is important to help develop your writing skills, accounting might help as you may take cases with accounting issues, and debate or public speaking to help with courtroom presentations. Keep in mind that law school will generally teach you about the law but not the specific procedures for your geographical location. Being an intern at a law firm will help with procedures and the reality of the legal practice. Psychology would also be helpful as you will be dealing with different personality types and developing a compassionate approach will help.
Bachelor’s degree in law (LL.B) can be pursued in India only after completing an under graduation degree in any field, such as B.Com, B. Sc etc. or choosing to pursue an integrated honours degree.
The minimum age to enrol in an LL.B course is 20 years and the maximum age is 30 years.
So if you are studying high school you can choose either Science or commerce subjects for your 11th and 12th Standard.
In the US, none. Although being a lawyer requires analytical skills and strong communication skills- skills which are naturally honed through classes like math, English, writing. Public speaking training is helpful too, and debate team if your school has it. Good luck!