The A-number is printed on your EAD (labeled 'USCIS number').
Yes: Check “yes” - all STEM OPT Extension applicants will have previously filed the I-765 when applying for their 12-month post-completion OPT. See the Instructions for Part 6 for more instructions.
See our website for more instructions on how to retrieve your I-94 number: https://www.kysu.edu/academics/college-acs/school-of-ace/international/current-students.php. In some cases, your most recent entry to the U.S. was after a short trip to Canada or Mexico, and there will not be updated trip information in your I-94 record or in your passport. This is standard, and you can have different information in Questions 16 & 17 from what appears on your I-94.
Most OPT applicants will write "F-1 Student" for items 24 and 25.
If you have changed from a different immigration category to F-1 status by filing paperwork with the U.S. government, include a copy of your change of status Approval Notice.
Write 'c 3 C' if you are applying to extend your post-completion OPT based on your qualifying STEM degree
Degree: write your degree level and major, for example: Bachelor's in Biology.
Provide your employer's name as it is listed in E-Verify
Employer's E-Verify number—confirm this number with your employer; it is not public knowledge.