Strengths:
* High GPA: A 4.18 weighted GPA and a 4.37 unweighted GPA in your junior and senior years are excellent and demonstrate strong academic performance.
* Good SAT Score: An 1850 is a competitive SAT score, although it's on the lower end for admitted students. The 800 on one subject test helps boost this.
Weaknesses:
* Limited Extracurriculars: Three extracurricular activities is on the low side for UC Berkeley applicants. Admissions committees want to see a well-rounded applicant with demonstrated commitment and leadership in several areas. Quantity isn't everything, but having more would strengthen your application.
* Volunteer Hours: While 200 volunteer hours are commendable, the impact will depend significantly on the nature of the volunteering and the leadership roles you may have taken within the organization. Just the number of hours itself isn't as important as the quality of the experience and its reflection of your personal qualities.
Overall Chances:
It's difficult to give a precise percentage chance, as UC Berkeley doesn't release such data and admission decisions are highly subjective. However, given your strong academics and decent SAT score, you have a *reasonable* chance of admission, but it's certainly not guaranteed. Your application will likely fall in the "competitive" range.
To improve your chances:
* Strengthen your extracurriculars: Focus on depth rather than breadth. Demonstrate leadership, significant accomplishments, or impact within your activities. Consider adding a new activity if possible, even if it's just joining a club with meaningful involvement.
* Highlight your accomplishments: Your application essays and letters of recommendation are crucial in conveying your personal qualities, passion, and potential. Make sure to showcase your achievements and contributions in your extracurricular activities and volunteer work. Quantify your impact whenever possible.
* Strong Letters of Recommendation: Secure strong letters from teachers who know you well and can speak to your intellectual curiosity, work ethic, and character.
* Compelling Essays: Your essays are your opportunity to shine and demonstrate your unique personality and interests. Spend significant time crafting compelling and well-written essays that highlight your experiences and aspirations.
In short, you have a fighting chance, but you need to make your application as strong as possible in all areas. Focus on showcasing your unique qualities and passions, and demonstrate your potential to thrive in a rigorous academic environment. Don't just list your activities – demonstrate their impact.