There are so many replies. Please let me answer these one by one.
jester:
"The return of my real money investment is 50%." Today, it's 49%. But I think this transaction can't say anything. Frankly, I only put 1000 dollars in this account, and I only bought one stock. It's not a penny stock, anyway. I bought it at $19.30, only 46 shares.
I am a poor student. I admit. Everything in American is expensive in China. so I have a tight budget. But this doesn't mean anything to my investment.
You can't afford the living cost, it's your problem. It means you need work hard to make more profit. Many other companies are more generous than you, fortunately.

As far as I know, my classmate got an offer $9000 per month to work in Russia.
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bungrider:
You are very careful.

Actually, before I started to enter the market, I just waited and did nothing. I heard many good news about American Economy. The trigger was good news about Yahoo. After Yahoo jumped from $10 to $14, I observed it for a few days, then long some stocks catiously.
At that time, I bought the stocks which I studied cases about them.

Funny? These companies analyzed in class became my first targets. But you can see from my chart that I didn't beat the market. It stayed with the indices. But at that time, I found that NASDAQ was stronger than other two indices.
Just during the days American was going to declare war against Iraq, I found the whole market still went down. BUT you can see the performance of Yahoo, Amazon, and Ebay. So I thought what's behind the price? What will be after Ameircan wins this war?
I adjusted my portfolio, and increased the weight of these three stocks.
I believed in the capability of American army. Did you?
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Trader99:
Thank you very much for your kind offer. It will be great if I can work for that fund.
I think you must have made a lot from Chinese B share market.

I only doubled my dollars.

Unfortunately, at that time I need dollar to go to American, I didn't put much in that market. Otherwise, I can live better now.
Frankly, I think I will get more than I can give. This is a large fund, absolutely I will learn a lot. "Give wood in snowy days" is what we Chinese say if you give a hand to a person who need help desperately.

I really appreciate it very very much if you can.
Now I answer your first question, and I hope this also answers those "sharks".
First, I know clearly what are my weakness: a foreigner, no former "formal" experience, and lots of native competitors.
So I focus my endeavor on local companies and smaller companies. At that time, the portfolio I managed was only 15% return. No one was interested in me. I guess maybe they also have the same thoughts as those "sharks".
But the performance of my portfolio might be the only way I can sell myself. If I can't do it well, how can I convince my boss hire me? In fact, my pressure was even higher than those trading with their REAL money. At that time, I faced a problem. Amazon often appreciated above the maximum percentage. I had to sell a few shares to meet the rules. I wrote emails to professors asking for help!!! Anyway, it's my first time to obey rules. Later, these three stocks appeared flat or even worse. You can image how I felt. I also don't have enough resources to screen the stocks meeting my criteria. Fortunatly, the stocks I bought with only 5% weight came into my eyes. These stocks I observed for a while, and they were obviously stronger than those stocks. I adjusted the weight of my fund again. It's the second rally you see on my chart.
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gaj:
Thank you very much for telling me these things. I know why I come here. I know why I gave up the good days in Shanghai and pursue a MBA degree here, because I want to be a fund manager. I don't expect to be a trader at the beginning. I need expose to this huge market, and I need learn more about thousands of companies in this market. I don't mind starting at the entry level. Not at all.
Today I got a interview from a hedge fund. I feel good. This might be a good start for me.