I am currently working on H1 and my project will expire on 30th April ,meanwhile i am planning to take Master course starting from July [means F1] so my questions are

1>How legal and convenient it is to change status from H1 to F1 ?

2>Can i transfer to f1 before 30th April for the classes starting from July ?

3>Once i get a new project in middle of my masters,what is the process to go back to H1 ,
can i continue with my current employer if they get a new project for me or i need to search for new employer and pay transfer fee again (from F1 to H1)

4>What is the process for my current employer to bring me back from f1 for new assignment in middle of my course?

Hope to hear from you soon.