UK IELTS & English tests - Study without IELTS

Is it true that with my state board English score, I have high chances of getting an IELTS waiver in UK/Germany?

Do I need to take the IELTS exam or can I get an exemption based on my English scores in UK/Germany for a Master's?

Is it possible to get an IELTS waiver based on my academic scores and graduation year in UK/USA for a MBA?

Will my work experience of over four years qualify me for MBA programs and possible GMAT waivers in UK?

How can I proceed with my application if I do not currently have a valid IELTS score but have a MOI (Medium of Instruction) certificate in UK?

Can I get an IELTS waiver based on my bachelor's medium of instruction in UK/Singapore?

Is English proficiency sufficient to study in the UK without IELTS if my education medium was English?

Which countries require IELTS for admission, and which countries offer IELTS waivers in UK/Australia for a Postgraduate?