Go to overpass link :- http://overpass-turbo.eu/s/mRF
Click Export and take level0 editor [About 20mb]
Browse and add each wikidata qid and upload
wikidata = Q25203056
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