You may order the Bengali correspondence courses from Child Evangelism Fellowship in Los Angeles.
Child Evangelism Fellowship in Los Angeles
Emmaus India https://emmausindia.in
If you want to see if there is a Source of Light Bible Correspondence Course ministry in your country and in your language, please go to this website link and search.
If you have any questions or need help finding a particular video, tract, book or any other Christian resource in any language of the world, please contact firstname.lastname@example.org