My company in the UK is letting me work in Singapore via their SG registered company. To ensure everything goes as smooth as possible I'm going over the EP form with them and have a few questions, if anyone can help

1) Passport sized photo - are UK passport photos the right size?
2) Applicant's Education - highest will be University and I have a copy of my certificate. Then I listed my A-Level education but I can't find a copy of those results - will that be an issue or is the University certificate enough?
3) Fixed vs Basic salary - MOM site wording confuses the hell of out me, they seem to suggest its the same thing (basically what I'd be paid each month excluding overtime, bonus etc).
4) Address where the duties will be performed - I'll be working from home, but obviously since I'm not there yet I won't have an address. What should be used here?
Thanks in advance!