1. Go to overpass link :- http://overpass-turbo.eu/s/mRF
2. Click Export and take level0 editor [About 20mb]
3. Browse and add each wikidata qid and upload wikidata = Q25203056
4. QIDs of districts can be found in this link :- http://tinyurl.com/jbkfn6p

District Map in English Wikipedia:- here

District Map in Malayalam Wikipedia:- here