USCIS provides Information on Filing Form I-539
USCIS reminds applicants to include all required evidence when submitting Form I-539, Application to Extend/Change Nonimmigrant Status. The required initial evidence for nonimmigrants requesting an extension of stay is included in the instructions for Form I-539. Initial evidence is required for all applications regardless of whether they are electronically filed in USCIS ELIS or mailed to USCIS.
I applied green card for me and my family through Rajiv Khanna's office and it went through successfully. Its been a great experience working with his team throughout the process. Diane Lombart was the one assigned to my case from their end. She has been very supportive, responsive and encouraging. No matter how many questions that you put or how many emails that you send, she handled all of them very patiently. She very well understands the emotions one goes through (eagerness, frustrations etc) during this process and be was very supportive during tough times. Thanks Diane for all the support!!