AOA every one,

I have few questions about resignations from Permanent Govt. Service. It will be appreciated if some one may kindly clarify queries. The questions are as follows:

1. I think the notice period is three months for resignation from service, so can I give apply for waiver of notice period against my salary ? If yes do I have to pay three months salary in cash or What?

2. I have 300 days of EL in my account, can I go on leave for three months and ask them to consider my three months leave as notice period? as I need to resign immediately?

3. My situation is that I have to immediately go out of Pakistan to avail an excellent opportunity, which i don't want to miss? My option is to go on ex-Pakistan leave and then resign from there but that is not a viable option as I want to leave my job on good note? Any advice in this regard would be appreciated.