Hi GayaKarna,
It might be that you haven't imported your Little Math Curriculum content yet -- this is a separate step from activating your license key, which I think you've already done. If you are also missing your complete curriculum in Little Reader, you may follow these articles for instructions on getting the rest of your curriculum:
If you purchased a boxed set: (same steps apply for Little Reader and Little Math)
http://support.brillkids.com/entries/20426512-importing-your-little-reader-lesson-content-from-the-content-cd-roms-included-in-the-box-setIf you purchased download-only LR and LM, or if you want to start your lessons while your package is being delivered:Importing Little Reader Lesson Content -
http://support.brillkids.com/entries/20432281-importing-your-little-reader-lesson-content-from-your-account-management-pageImporting Little Math Lesson Content -
http://support.brillkids.com/entries/20432296-importing-your-little-math-lesson-contentAfter you've imported all your content files, you should be able to access your complete curriculum. Do let me know if you run into problems while following the instructions in the articles.