There is 3 questions i need answered, I only have 40 min to turn it in. can you

There is 3 questions i need answered, I only have 40 min to turn it in. can you help 
Essay: Pick one of the two questions below to answer.  Your answers should be at least two-three paragraphs in length.  Make sure you include an introduction and a conclusion.  Be sure to address every part of the prompt for full credit. 
1. Explain and analyze the events of 1968 in Mexico.  What led to the Tlateloco massacre?  Why was this such an important impact on Mexico’s political system?
2. What were some of the key negative impacts on Mexico in the 1980s?  Think economically, socially, and politically.  How did these impact the PRI’s control over Mexico’s politics?
Essay: Pick one of the two questions below to answer.  Your answers should be at least two-three paragraphs in length.  Make sure you include an introduction and a conclusion.  Be sure to address every part of the prompt for full credit. 
1. Explain and analyze the caste system of Mexico.  Why did this system exist?  Who were at the top/bottom?  What was the position of mestizos in this system? 
2.  What is mestizaje?  Explain how this has been used in Mexico historically and why it is such an important view for Mexico.  
Essay: Pick one of the two questions below to answer.  Your answers should be at least two-three paragraphs in length.  Make sure you include an introduction and a conclusion.  Be sure to address every part of the prompt for full credit. 
1. Explain why author Mario Vargas Llosa called the Mexican political system under the PRI the “perfect dictatorship.”  
2. What were some of the key reasons that led to the PRI’s loss in the 2000 presidential elections?  Consider both domestic and international impacts.