Sophomore GPA

I am currently attending best high school in MD. I am a hard working sophomore student but my school is really hard. Freshman year I had a GPA around 3.0. Beginning of the sophomore year I have 3.4 or so. I have a low GPA compare to others and I don’t know why. I am worried about my future because I feel like my dream college such as Georgia tech or Maryland college park, or Pittsburgh won’t accept me. Money isn’t the problem. My parents can support me. I have 271 hrs of SSL hours and next year I am getting a gold president award for those SSL hours. I heard I can raise my chance doing extra actives so this year i decide to join Model UN. My friends around me are getting good grades and I am so nervous that I am doing bad. Please let me know if you need my classes info to give detailed advice.I really want to go a good college please help me out with advice and what I should do more.

Focus on getting good grades instead of piling on EC’s. Grades are more important.

Can you give me more specific details about what other things I should do to raise my chance?