How can I apply for an F-1 visa from my home country, Cameroon while currently on J-1 in the US?

As my colleagues have noted a change of staid is needed. Your DSO and immigration attorney are good resources.

Im 35 years old. Im out of status. Can my mom, who has a greencard apply for me to have legal status?

Your mother may file a petition for you but you are not eligible to adjust. Speak with an immigration attorney to discuss possible options.

Can my friend get in trouble if immigration officers think his girlfriend (now wife) entered the US by committing visa fraud?

If fraud was commuted there is reason to be concerned.

Am I eligible to apply naturalization now or ever?

It does not mean disqualification necessarily. You must disclose and as my colleagues indicate speak with an immigration attorney.

Do i fill Zambia (which is my birth Country) or India ( which is the country in which I hold passport)?

Diversity is based on country of natural origin

How to issue a work permit while obtaining M1 Visa

The M visa is a non immigrant visa and does not permit and intent to remain permanently in the US. Speak with the university as to employment as an...

How can I obtain a work permit in USA?

The M visa is a non immigrant visa and does not permit and intent to remain permanently in the US. Speak with the university as to employment as an...

How to know ARO process validity period?

The waiver is noted in your passport and is valid concurrent with the visa.

Yes you have the 60 day period when your spouse's OPT expires

F1 student with asylum pending, choosing between using EAD or CPT for summer internship.

The EAD permits employment anywhere. Speak with your DSO as to maintaining student status.