Hi,

It can be basically any sub-industry. Focus on the most common industries in the following priority (sorted by probability of getting a case): 1-retail and CPG; 2-airlines; 3-Telecom; 4-banking; 5-natural resources; 6-tech

There are several sources of information that will help you develop the business sense:

1) Company reports, equity reports, IB roadshow docs - Probably the most useful source. They usually have a good overview of the company and industries.

2) Cases - you simply solve 50-70 cases and get a broad knowledge of different industries, common pitfalls and questions. The key here - find good partners who already had case interviews with MBB companies

3) HBS cases - quite useful, but not sure if lot's of them available publically. Probably worth buying

4) Industry Books - one good book about airlines with numbers and industry analysis can give you all needed industry knowledge

5) News, Industry blogs

For each industry, you should understand:

• Revenue streams
• Cost structure
• Margins
• Key performance indicators
• Key revenue drivers
• Industry trends

I strongly recommend drawing the typical structures for each industry - profitability, value chain, etc

Then I will switch to getting functional knowledge:

• Marketing (Brand and trade marketing tools, etc)
• Supply chain (Ops metrics like cycle time and throughput time, distribution and delivery specifics, etc)
• Operations (Process optimization basics)
• Finance (Very basic Finance and Valuation)

Good Luck