British Empire Spy

Does anyone out there know of this film?  I think the film was made between 1940s and 1960s and staring an actor like Sabu (I can’t find the film amongst his listings).  I think it is a British Empire film located probably in India or Africa.  A local lad is recruited as a spy for the British Army and sent off to be trained (possibly by an Arab).  In his training he is trained to remember different objects on a tray, counting things in the thousands and how to resist be hypnotized.  Once trained he gathers information about enemy troop numbers and reports them back to a British Major.  My feelings are that it is a film a bit like “The Four Feathers” or “The Drum”.

Thanks