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Various international and overseas Mathematics organisations exist. See their websites for more information about membership. Many will have links to careers advice and research information.
There are several organisations devoted to study and research in Mathematics. Some of them have special student membership rates which will give you access to their libraries and online resources.
Promotes "mathematics research, education and careers, and the use of mathematics in business, industry and commerce." Very low student membership rates and a special student section on their website. Organise conferences and other events.
Based in the US, but of global significance in research, publications, and mathematics education advocacy. Organise conferences and publishes research.
"For the advancement, dissemination & promotion of mathematics in the UK & worldwide." Publish several journal and book series. Website includes a careers section. Offer various grants and prizes. Associate membership is open to Postgraduates and those in the final year of MMath courses.