No, getting a divorce does not automatically result in the loss of citizenship in most cases.
In most cases, divorce does not affect your citizenship status. If you are a citizen of a country, you typically do not lose that citizenship simply because you get divorced.
Citizenship tests and other related materials are available to the public at the United States Citizenship and Immigration Services website. Be wary of alternate website that offer similar services, citizenship is highly sought after and many scams and falsehoods exist on non-authoritative sites.
If you're doing RS aswell as Citizenship, you're most likely doing half GCSEs for both RS and Citizenship.
Ask the authorities but in most cases you can.
Obtaining a citizenship application for most countries can be done online, you will have to download the forms, fill them out, and return them. Most applications for citizenship are handled by immigration, and will come with requirements to become a citizen of any other country.
For the Greeks, the most important part of citizenship was to be involved in public discussion, debate, and activity designed to improve the welfare of the community.
Section 5 of the Citizenship Act sets out that the minister responsible (currently the Minister of Citizenship and Immigration) can grant citizenship in his authority as a minister of the Crown. No advice to the Governor General is required, as citizenship in Canada is not issued by the Governor General-in-Council.
Most probably there will be no effect, as long as you fulfill the requirements for citizenship.
In most countries only the citizens have the right to vote, foreigners are excluded.
The citizenship will not affect the marriage. While it could be considered perjury, it will not invalidate the license in most places.
The rules of dual citizenship are quite easy to understand. Most countries neither deny or recognizes dual citizenship. However, if you are a dual citizen you must enter the country with the country's passport you own.