Science, Maths, Computing Olympiads in (Links)

http://www.iarcs.org.in/inoi/

http://www.isical.ac.in/~rmo/

http://ebook3000.com/Berkeley-Problems-in-Mathematics_90817.html

http://www.sofworld.org/

http://www.imo-official.org/

http://olympiads.hbcse.tifr.res.in/

http://www.iapt.org.in/