How should one prepare if you want to go to the USA for Bachelors?
Admissions preparation: – 3 Main key areas everyone should know about while preparing for getting admission into top schools are:

1. ENGLISH: –

About 6-8 years of high-quality English education: both reading and writing skills along with knowledge of literature.

Fast reading: Practice speed reading as well as comprehending at the same time. The more you practice and master the skill the better it’ll be for you in your long career path.

Retention: This is an important piece if you want to maximize the time you spend in studying or reading materials. Your main goal should be to retain each item that you read so that you do not need to

Vocabulary: Make your vocabulary as strong as you can and practice and learn a new word every day. Try to use that word in your daily life and repeat them frequently in sentences to be able learn them properly. Watch American TV shows, movies, and new channels

Speaking: Practice expressing yourself in English as much as you can. The better your communication in English is the more successful in life you can be.

2. MATH: –

Basic algebra:
Linear functions and equations
Single variable equations

Advanced algebra:
Polynomials
Quad equations
Exponential functions and equations
Nonlinear equations

Data analysis:
Mean, median, mode, SD
Probabilities
Graphs and plots
Ratios and proportions

Geometry and coordinate geometry:

Commitment to leadership roles while demonstrating experience that you gained through these activities which gives you an added advantage compared to a regular candidate.
Here we’re talking about quality of work which is authentic and things you strongly believe in. Some of those examples can be a leader of a sports team, swimming team or others. Member of community services which helps others in some share or form. Any kind of internship related to computers or any other technology which enhances your analytical and critical thinking skills. You must show the motivation and enthusiasm which has taken you one extra step in learning something new or unique.
Having extracurricular activities in your resume gives you a competitive advantage over your competitors during the admission process. If you know which area you would want to major then you are encouraged to pursue extracurricular in that area which will boost your fundamental knowledge in that area before even getting started.

Volunteering activities:
Volunteering is a very good extracurricular activity to gain valuable life experience and skills, show your commitment beyond regular academics, help your community. You can volunteer in the areas of arts, music, sports, cultural and community building events, museums and in many areas’ fronts. 

Student governing bodies and academic clubs:
You can apply for various roles and positions within student government bodies or academic chapters. You can demonstrate leadership and responsible roles where your peers look up to you and you become a role model.

Impromptu extempore speeches, group discussions and debates:
You are encouraged to participate in events like these where you can grow your communication, confident, and become more of an extrovert human. You can join a Toastmasters club if you have one nearby to develop your communication power.
Building networks and relationships and getting recommendation or reference letters:

Build strong relationships with your mentors, teachers, principals, instructors, such that they can stand behind you and give you professional recommendations which will help you get admission into good universities and colleges. Letters of recommendation are also important piece of catalyst for admission into good programs.

Internships/ Work experience:
 Show how to balance life, multitasking, ability to take ownership and responsibility etc without hampering academic studies etc.
 Ability to maintain a healthy balance in life throughout.
 Other than good academic grades these extracurricular activities show students have the below skills:
o Time-management skills
o Ability to prioritize
o Higher motivation level
o Ability to take extra responsibility
o Leadership qualities

College admission committee pays attention to:
• How deeply you’re involved in what you’re doing is lot more important than how many different activities you’re involved with as far as extracurricular is involved
• How have you improved in your academics over the years? Meaning your grades/scores/marks should generally tend to improve over the years and should be in the top percentile
• Strength of one’s pre-college curriculum is also important. How strong and vast were your course curriculum? Are these relevant to what you’re going to pursue in your under-grad studies.