How did access to government differ among the first, second, and third estates?

Until the French Revolution, which started in 1789, French society was divided into three estates under the Ancien Regime.
The First Estate consisted of the clergy, the ordained ministers of the Catholic Church in France. Despite being just 0.5 percent of the total population of France, the First Estate owned 10 percent of the land in France and paid no taxes. The members of the First Estate were often considered the highest in the social hierarchy.
The Second Estate consisted of the nobility, meaning its members had special, aristocratic titles that granted them privileges. Many nobles were influential in the courts and government. They owned between 20 and 30 percent of the land in France but made up just 1.5 percent of the population, and like the First Estate, they paid no taxes.
Finally, the Third Estate consisted of everyone else in French society, from peasants and laborers to bankers, merchants, doctors, and other professionals. Thus, some members of the Third Estate were wealthy or well-off, while others were poor. The Third Estate made up 98 percent of the French population but paid the most in taxes, with the majority of the tax burden falling on the peasants. In addition the Third Estate received just one vote in the Estates General, the legislative body of France. Thus the Third Estate often found itself outvoted by the combined votes of the First and Second Estates, leading to discontent and helping spark the French Revolution in 1789.