Yes, you heard right that US colleges emphasize on extracurriculars a lot and that is because they have a holistic viewpoint towards applications. I suggest, even if your school doesn't offer much, try looking for something outside your school for eg., sports, dance, painting, drawing, music etc. which can be learnt and proficiency can be attained within a few years of practice. Alternatively, you can also start blogging online. You can volunteer at an NGO or probably give computer or english classes to your domestic help’s children. There are numerous options out there, you just need to find the right ones for you and get working on them. Make sure you are not jack of all trades and master of none.
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