if your work permit is cancellation letter was submitted and it indicated the date of your last work day. legally, your permission of stay (if your extension /permission is based on being employed on that company), is cancelled. but you need to go also to the immigration office to have it "stamped". some immigration doesn't care about this permission of stay void stamp. but some do.... in other words, if you intend to work again under a different immigration that cares about it, they will either fine you for overstay or will not allow you to get an extension because your previous permission was not stamped "properly"... example, samchuri square requires this stamp when doing extension and will ask you to go back to your previous immigration office to stamp it in.

i think your TH driver's license must past the expiration date before you can apply for renewal... most doctor cert are good for 1 month.

if you're 90 day report is before you fly out, no need to report early, but if you fly out few weeks after your 90 day report. some immigration will catch u not doing the report on the due date and "might" fine you for not reporting.

some immigration still uses these forms especially for 1st time extensions...khonkaen immigration asked us to fill these forms including the last page when the overstay ban was enforced years ago. then we just continue including these forms every year.

If you are coming from the Philippines, you should ask your university to send you documents and then apply for a proper visa. But if you choose to go out without securing it, the PH immigration will consider you as a "tourist" and you need to satisfy them that you are traveling as a "tourist", you can't simply tell them that you are going out to study in a university without any proof of acceptance from that university.

its usually the owner of house's responsibility but most of the time it's being pass to the one who rent the house.

depends on your local immigration office. some of which requires you to notify them within 24 hours you arrived in your place. some will only ask you to submit them on your yearly extension.

good for those who already planned their trips to different countries with out paying more for visa because they only staying in Thailand for few days then moving on. This doesn't affect much for those nationalities with bilateral agreement with Thailand that they don't need to pay any visa when they arrive because they visa exempt on arrival... again, it depends on your purpose, nationality, style of travel/travel plans.

if you are applying for extension (on tourist visa), some immigration ask for proof of address, hotel, accommodation, if staying with friend's house). without proof, they will not let you extend your permission of stay (i know someone that was refused in Korat)

you apply transit visa if you intended to enter thailand and stay for period of time before proceeding to your country of destination. but if you don't have any other destination except Thailand from your origin, in my understanding is you can not apply for a transit visa when you go to the embassy and apply for a visa.

Transit Visa

This type of visa is issued to applicants who wish to enter the Kingdom for the following purposes :

To travel in transit through the Kingdom in order to proceed to the country of destination or to re-enter his/her own country (category "TS")

To participate in sports activities (sportsmen, sportswomen, etc.) (category "S") ***

*** Those who are scheduled to stay in the Kingdom longer than one month , Non-Immigrant Visa category "O" can be issued.

The person in charge or crew of a conveyance coming to a port, station or area in the Kingdom (category "C")

Note: Applicant is not permitted to engage in any occupation or employment.

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Tourist Visa

This type of visa is issued to applicants who wish to enter the Kingdom for tourism purposes.

Note: Applicant is not permitted to engage in any occupation or employment.