Change of status

- H1B 60-day grace period starts on the date of getting notice of layoff from the employer, on the date of the severance paycheck, or on the last date of the regular paycheck?

- During H1B 60-day grace period, what is the best time to apply for B1/B2? When 30 days are left, 15 days are left, etc.?

- H1B is for 6-years of work, or 6-years total? I mean does unemployment time or B1/B2 time etc. also counts in 6-years of H1B?

- After layoff on H1B, if decided to go to school, then how to stay in US until getting admission decision and until school starts, that could take many months.

- After layoff on H1B, what is the better option to choose between B1/B2 and F-1?

I have just 50 days left on my H1B grace period, and I need to get an employer to transfer my H1B, or I will be kicked out of the States. My question is, which of the following paths should I choose?

1) I have a Canadian visitor visa, which is for six months, so can I go to Canada if I don't get a job by the grace period?

2) If I don't get an employer should I shift on B1/B2? If I do, how can I come back on H1B? Is there anything else you suggest to keep my H1B active?

Case: Picked for H1B lottery.

- What happens if the company lays off after June but before October 1? Would I stay on my current visa status? Or will I be on H1B but with a 60-day timeline to find the next job?

- Does the status automatically change to H1B on Oct 1? or does immigration require paystubs for a couple of weeks to prove our employment?

- If I file the petition with two companies separately, how will immigration decide which one to approve? Will they approve both?

- Are there any travel restrictions from June to Sept