Hello there! Great question! As an expert in the field of immigration, I'd be happy to share some information about the eligibility requirements for F-1 Optional Practical Training (OPT). To be eligible for OPT, you must be a current F-1 student who has been studying in the US for at least 9 months and must be in good academic standing. Additionally, you must have a job offer related to your major field of study and the training must be an integral part of your program. You may also be eligible for pre-completion OPT, which is available to students who have not yet completed their degree program, or post-completion OPT, which is available to students who have completed their degree program. OPT is limited to a total of 12 months, but some students may be eligible for an additional 24 months of OPT if they are working in a STEM (science, technology, engineering, or mathematics) field and meet certain requirements. The eligibility requirements for the STEM extension are strict, so it is important to consult with an immigration attorney or a designated school official if you are considering this option. I hope this information is helpful! If you have any further questions, feel free to ask!