Following up on Laura's answer, I will recommend you look into exporting your Moodle content into one of the formats supported by Kolibri. For example content can be packaged into standalone HTML5 zip files, see .
Kolibri currently supports a limited number of exercise formats: single select, multiple select, and input questions. If your questions fit well into these categories, it might be possible to write a conversion script and import them into Kolibri. See here for more info. There is currently no way to automatically do this conversion, but this is something we consider in the future.