Listening test for IELTS - Cambridge practise session with audio and answers:
Practise Resource -1
Practise Resource -2
Practise Resource -3
Top Mobile apps for IELTS preparation.
https://play.google.com/store/apps/details?id=io.fusetech.bcet
https://play.google.com/store/apps/details?id=com.ngocbach.eilts
https://play.google.com/store/apps/details?id=com.britishcouncil.ieltsprep
https://play.google.com/store/apps/details?id=com.ubl.ielts
https://play.google.com/store/apps/details?id=com.fr_solutions.ielts.writing
https://play.google.com/store/apps/details?id=bc.leg
The above are few of the apps that I used for my preparation apart from the British Council library resources. You may also try the other apps available and leave your comments for other's benefit.
I suggest you to use the IELTS preparatory books available at BC library for improving your score.
I wish you all success.