F2A moved to F1?

[kefisa 0]

hello i am new here like the forum alot of good info
ive a few challenging questions.. i hope you could get me an answer for some of them
my case is a bit long so i tried to do it short as possible.
.
my name is kel i am israeli citizen.
my date of birth 11/28/88

its starts while my dad(bora-green card holder at that time) apply i130 petition for me on 8/25/09
i130 aproved on 9/20/10 under FB2A CSPA (i130 filed 8/25/09)
i485 filed on 9/7/10and i765 for EAD on same time(VB was1/1/10)
ASC appt for i485 and i765 on 11/1/2010
Interview appt at USCIS on1/11/11(VB back to 1/1/08 under FB2A)
--and then i got notice of file transfer to NBC on 6/17/11
On 2/11/11 bora(patitioner) naturalizaed
On 8/17/11(lawyer) advice NBC :(patitioner)naturalizaed
I have to say that all this time i was under F1 status and im still maintain F1 since it was aprove on 10/3/08(transfer schools)
(Enter to US with B2 at 5/26/08 and applying COS to F1 on 7/25/08) for now ive my F1 keep going to school and (renew EADs since 9/20/2010 untill now)

my questions is:
-if i can drop the F1 status and stay on i485 TSP?
-if i485 denied for any reason can i apply for any other visas?
-if i keep F1 and in some point while waiting to PD, 485 is denied. can i file COS to E1/2 or H1 while im in the US (if i meet the requirements for the status)?
-anther question: can i get OPT from school if ive i485 pending?

(cos=change of status)

thank you so much sorry if a bit long