Should read in General Studies-Prelims

Coastal Zone Regulation/Management
Biosphere, O2, N2, H2O etc cycles, Food Chain, Ecosystem basics.
Climate Change, Ozone depletion, Smog, Acid Rain, Pollution & its types
Vision and lens & mirrors, latest Nobel Prize related basics, Common sense logical understanding of Light, sound and other waves.

Some particular diseases & their causative agents, symptoms and carriers etc. which include:
Vector borne- Malaria, Filaria, Kala Azar, Japanese Encephalitis, Dengue, Chikungunya.
Vaccine preventable- Diphtheria, Pertussis, Tetanus, Polio, Measles and Tuberculosis.
Others- Leprosy, various Influenza (eg: Swine Flu, Bird Flu)

Bioethanol, biodiesel- their plants etc
Economic Survey- Poverty, Social, Human Development related chapters + Industry, Commerce, Economic Data
Fundamentals of the Economy- Fiscal & Monetary Policy
WTO, IMF, World Bank &WBGroup, UN Agencies, recent UN resolutions, FATF, EU, ASEAN, SAARC, APEC, GCC, Arab League, African Union, BRICS, BASIC, IBSA, RIC, BIMSTEC, NATO, CIS. [Read atleast the wikipedia pages of these organizations and on that atleast the data in the table on the right of the page and the background.]

Egypt. Libya. Yemen. Sudan. Somalia. Tunisia.

Vitamins, Organ Systems (only basics and not ultra-deep nomenclature) especially Digestive, Nervous, Respiratory & various hormones, proteins, fats & fatty acids, lipids, carbohydrates, minerals.
Photosynthesis, agricultural plants- their required climatic & soil conditions, and their GM or hybrid varieties that have been in recent news, Hybridization.

World Heritage Sites especially in India. New additions, if any.
Buddhism (especially because Tibetan Buddhism was in news this year), Jainism, Indus Valley Civilization.

Conventions & Protocols:
Ramsar, CITES 1973, Bonn, Montreal, Cartagena, UNFCCC, Kyoto, Copenhagen, Cancun, Basel, REDD & REDD+, Nagoya, Doha Development Round, Rotterdam, Stockholm, Vienna, CTBT, UN Conventions that have been making news eg: UN Convention against Corruption which was ratified by India in May 2011.
visit: http://en.wikipedia.org/wiki/List_of_international_environmental_agreements

Biosphere Reserves in India-those that are of international importance, National Parks, Project Tiger & Tiger Reserves, Project Elephant. Read about endangered species of India and their locations.

India's Military Exercises of the past year.
ISRO's recent launches & activities.
Defence - New achievements, missiles etc.

Some peak events in Sport in the last year, especially Tennis Opens. Records broken. Indians performance at different events. Indian sportspersons names who won medals in the last year, especially those that grabbed attention or created history. Arjuna Awardees.

Chemical & other such things the recent news. eg: Endosulphan, BT cotton, BT brinjal. Go into the basics that connect these to everyday life apart from technical stuff & the factual aspects.

Polity- Election Commission, Judiciary, 243-243ZG, FRs, DPSPs, Duties, Emergencies of different types, CAG, CVC, CIC, CBI, Lokpal, Recent Bills/Acts/Amendments.

Schemes of the Govt especially those of the last few years and the Flagship schemes.

Geography- River Systems, Vegetation, Soil types.