I'm adopted by a US citizen but I entered the US Illegally.

I agree with my colleague. Too many complex issues to be dealt with on this forum. Make a consultation with an attorney.

Can visa officer find out whether i have really appeared for sat exam? how?

No.

For I-485 interview ( marriage to USC ),the employment letter dated like 3 months ago,but I have all the recent paystubs ?

The more evidence you provide that you are currently employed the better. Recent pay stubs are good, but an employer letter is better.

How long is taking approximately for an unmarried child (who is 20 years old) of a permanent resident to immigrate to U.S?

I agree with my colleague. The fact that he will turn 21 means that the process will take a lot longer. Best to consult an attorney.

Re-entry permit

I recommend consulting an attorney. It is not advisable to leave the US for over 6 months after having just been granted a sb1 visa. I understand...

It is good that you have a tracking record. There is no rule about how long it will take USCIS to process your RFE documents.

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My wife and I have been married for 10 yrs now,her green card expired a few years ago.we sent money to 3 states and each time it

I agree with my colleague. Consult an attorney to assist you.

Can we open a joint account before I get my J1 visa?

You can open a joint account while the two of you are together. You have to be careful with J visas because some of them require to return to...

The crewman visa is one of the few visas that does not allow you to change status. It is best for you to consult an immigration attorney.

Can i get citizenship

This is a fairly serious issue and you should consult an attorney right away. With or without knowledge being married to 2 women at the same time...