There are several theories and models related to financial analysis and decision making that you should study for the Management optional subject. These theories and models provide a framework for understanding and analyzing financial data, as well as making informed decisions based on that analysis. Here are a few important theories and models that you should consider studying:

1. Efficient Market Hypothesis (EMH):
The Efficient Market Hypothesis states that financial markets are efficient and that prices of securities fully reflect all available information. This theory suggests that it is not possible to consistently outperform the market through fundamental or technical analysis. Understanding the implications of the EMH can help in evaluating investment strategies and making decisions regarding portfolio management.

2. Capital Asset Pricing Model (CAPM):
The Capital Asset Pricing Model is a widely used model for estimating the expected return on an investment. It provides a framework for calculating the required rate of return based on the risk of an investment and the expected return on the market as a whole. Studying the CAPM can help in evaluating investment opportunities and assessing the risk-return tradeoff.

3. Financial Ratio Analysis:
Financial ratio analysis involves analyzing a company's financial statements to assess its financial performance and health. It involves calculating various ratios, such as liquidity ratios, profitability ratios, and solvency ratios, to gain insights into the company's financial position. Understanding financial ratio analysis can help in assessing the financial viability of a company and making decisions related to investment or lending.

4. Real Options Theory:
Real options theory is an extension of financial options theory to real investment decisions. It recognizes that investment decisions often involve uncertainty and flexibility, and that the value of an investment can be enhanced by having the option to make certain strategic choices in the future. Studying real options theory can help in evaluating investment projects and determining their value under different scenarios.

5. Behavioral Finance:
Behavioral finance combines insights from psychology and economics to understand how human behavior and emotions influence financial decisions. It recognizes that individuals are not always rational and may be subject to biases and heuristics. Studying behavioral finance can help in understanding the psychological factors that affect financial decision making and in avoiding common cognitive biases.

In conclusion, studying theories and models related to financial analysis and decision making can provide a solid foundation for understanding and evaluating financial data, as well as making informed decisions. The theories and models mentioned above are just a few examples of the many concepts that you should study for the Management optional subject.