@uzair1990 , Salam Aliqum. Sukrya for all the answers
1. Based on your answers above, your exempt status came to an end at the end of 2023. Thus for 2024 you are a Resident For Tax purposes. So there is no change in your tax status ( Resident ) based on the immigration status change ( F-1 to H1-B ).
The withholding of FICA is because you changed from OPT/CPT to an employee.
IS there more I can do for you ? Did I forget to answer something ?
Where in Pakistan are you from ( Karachi ? ) ?
pk
