Letters / I like challenges / Summer intern cover letter [3]

It sounds good but till is not a word.

My curriculum tilluntil now comprises of courses like Web Technologies, Analysis of Algorithms, Computer Networks, Artificial Intelligence (IP), Information Retrieval and Web Search Engine(IP), Database Systems (IP).

Good luck on getting that internship.

Undergraduate / Public speaking/ California; Moment of success/ Neighborhood [3]

Unfortunately, the universe has a funny habit of conspiring against the desires of most people.

Scholarship / My communication skills/ business skills; Scholarship Essay - Making Difference? [4]

Reading is a vital tool for one to become acquainted with today's world, and with my business experience I would open up foundations and organizations to help protect our future.

I feel you can break this sentence in two. It would sound less of a run-on.

Undergraduate / 'quiet girl'/"The Power of Introverts''; Brown/ perspective/ being an introver [3]

Erica is so shy," add the comma. BTW I saw the ted talk about introverts too. I can relate.