Hi saharm24!
I'm also a F-1 Student in the US, except that I'm still Undergraduate. I might be a able to help answer some of the questions based from what I know regarding all these DV process.
1- Can I apply for OPT (while I have filed lottery forms), I have not applied for AOS? Is it possible they reject my opt because of green card file?
As far as I know, you can still apply for OPT eventhough you have won the DV Lottery as long as your status is still F-1. OPT is an extension of your F-1 visa. So, when you're on OPT, your status is still F-1 until you do AoS or change to another visa. But once you file for AOS (submit I-485), your status will change from F-1 to Pending Permanent Resident. This is where it will get tricky. They might reject your OPT when you're on this status.
2- How long can I work with OPT in a university. I heard OPT is for off campus work? Is it right? Do I have to be on J1 visa?
I have some International students friends at the University who work with OPT in the University. If I'm not mistaken, you can work as long as your OPT is valid (usually 12 months), then it can be extended based on your major/study for another 5 months. Before the OPT expired, you need to change your status to H-1, J-1, Permanent Resident, etc, or you have to leave the country. So, it is really depends on the University if they willing to let you work with your OPT on campus.
3- If the university supports me for J1, will J1 be denied because of lottery file.
I am worried because I remember people were saying they were not going to leave US (after filing DS230,122) because of possiblity of rejection on F1 stamp on their passport to enter US.
thank you for your help
I don't think filling DS230 and DSP122 will get rejection to enter the U.S with F-1 visa when you leave the U.S for a short time because you did not change you status yet. The problem is usually when you need to get a new visa in the embassy/consulate. Even this is still doubted, since you did not applied for AoS (submit the I-485 to USCIS) yet.
The key here is the I-485 form (Adjustment of Status Form). Once you submit this form to the USCIS, you loose any visa status that you currently have. In the I-485 form clearly said that if you leave the country after filling the form, your pending case might be rejected and you might not be able to enter the U.S. What's even worse is that once you submit the I-485 form, you will have a hard time getting any non-immigrant visa in the future. Why? Because when you fill in an application for non-immigrant visa like F1, B1, J1, etc, they will ask you if you ever adjust status or apply to become a immigrant in the U.S. Since you have to answer it thruthfully, you have to answer "yes, you have". This is could be a big reason for the U.S Embassy/Consulate to reject your non-immigrant visa in the future.
That is why, when you read the forum, everyone will tell you to "DO CP" if your CN is very high. The main reason is time. AoS usually takes longer to process (about 3- 6 months), compared to CP (1-2 weeks). If your number became current close to the deadline (Sept 30), you have a bigger risk of not getting the interview or not getting the visa. The other reason is because once you told USCIS that you want to do AoS (submit the I-485 to the USCIS), and for some reasons you didn't get the Green Card, there is a possibility that you have to leave the country or/and could never get a non-immigrant visa anymore.
The safest way is still to do CP, regardless if you have low or high CN. It is less convenient because you have to go back to your home country for the interview, but at least you don't risk loosing your status because you don't need to submit the I-485 form. If for some reason you failed the CP interview and didn't get the GC, just go back to the U.S using your F-1 or J-1 or visa and continue your study or work.
My recomendation to you. Choose to CP if possible and avoid AoS, especially when you have such a high CN. People who are doing AoS are usually the one with the low CN and have plenty of time to process it or for those who absolutely couldn't go back to their country to do CP (money, jobs, family, etc). It might cost more of your time and money to do CP, but it is worth it.
Talk to your International Student Advisor at the University. Most likely they know how to answer your questions. I did, and I was surprised that they used to have cases with students winning the lottery. First I thought of doing AoS because I didn't want to leave the country. I was affraid that I might get rejected to get back to the country because I won the DV. But, after weeks of reading and researching the web, I found out that I won't get denied to re-enter the U.S after winning the DV Lottery and even after submitting the DS230/DSP122. As long as I have a valid F-1 visa, a valid I-20, and never submit I-485 to the USCIS. AoS process is very lengthy and risky. I changed my mind, and told KCC to switch to CP. Less hastle, faster process, less risk, and I got an good excuse to see my family back home for 2-3 weeks.
Good Luck!