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.
i think its under 20k US dollars, so no problem. the poster mentioned he has 500k Baht, but didn't specify if he is taking it out or in Thailand.. if taking out, the maximum is 50k baht except in certain borders/countries. so he need to declare it.
The amount of Thai currency, in a form of banknote or coin, allowed to be brought outside the country shall not exceed 50,000 THB. In the case where Thai currency is carried out to Thailand's boarding countries, Vietnam and Yunnan District of China, the total amount shall not exceed 2,000,000 THB. However, the Thai currency brought out to the said countries in the amount of 450,000-2,000,000 THB. shall be declared to the Customs officers at the Customs checkpoint.