If H1B & H4 extensions applied together and premium processing done later, will both H1B & H4 extension be processed in 2 weeks?

Usually, yes. I am not sure what would happen is the H1 was premium processed later. Till last year, they would have been processed together.

Can I begin classes in dental school while my change of status from F1 OPT to H4 visa is pending ?

If you talk with the DSO, you should be able to get a I20 that will permit you to keep using the F1 till the H4 is approved. H4s usually take 5...

Security check pending for long time

Security check is the one step that does not get expedited.

Do I need to file i485 based on i130 approval now or wait for my priority date for my i140 to be current? ?

Google "visa bulletin". This bulletin will tell you the current priority date, both for the 140 and the 130.

When Can I apply for USA citizenship?

3 years after getting the green card.

J1 to O1

Yes you can file for both. If the O1 is approved, you can continue working on the O-1. However, before your green card will be issued, you will...

How to file form I 765 for wife ?

I agree with my colleagues. These are sufficient -- Form 797C ( Notice of Action ) - letter for finger print, since there is mentioned A#

Impact of Canadian PR on US Immigration processing

There is no connection between both.

My name is Paren and I am a US citizen, my wife is on F1 visa, how to change her status.

You need to file both steps for her green card. Once filed, she will get a travel document/work permit in 90 days and is also legally allowed to...

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Can a person after overstaying visa and deportation from USA find any legal way to immigrate to Canada?

You should consult with an immigration attorney to see if he qualifies to file any type of waiver. As of now the 10 year bar applies to him. If he...