As you are asking for World Geography topic/subject for preparation of UPSC IAS exam, so on your demand I am providing same for you :

World Geography: Broad Level Classification:

World Geography can be broadly classified into the following topics:

The Earth & the Universe
Landforms and their formation
Atmosphere
Wind System
Clouds & Precipitation
Hydrosphere
Different Types of Climate & Climatic Regions of the World

Preparation tips
1. Break Each Topic down into Sub-Topics

For instance, we classify ‘The Earth & the Universe’ as under:

The Solar system
Motion of the Earth – Rotation and Revolution – Day and Night
Inclination of the Earth’s Axis – it’s effect on seasons
Latitude and Longitude
Important Parallels and Meridians
Solar Eclipse, Lunar Eclipse and Tides and their significance
Earth’s crust
The Structure of the Earth
Classification of Rocks – Igneous, Sedimentary, Metamorphic


2. Identify Focus Areas & Prioritise your approach:

3. Use a School Atlas

4. Make your own Notes as you read

5. Test Your Preparation level & Learn from your mistakes