Scout Advancement
Advancement is the byproduct of a good Scouting program. A Scout learns, he does, he is tested, and then he teaches others. Below are some links that will be helpful in understanding Boy Scout Advancement.
 
For details on advancement requirement, see the BSA website:  
scouting.org
Second Class
 
Second Class is the rank above Tenderfoot and below First Class. A Scout can work on the requirements for the Tenderfoot, Second Class, and First Class ranks at the same time, but must be earned in sequence. The badge is awarded when the Scout completes requirements in the areas of Scoutcraft, physical fitness, citizenship, personal growth and Scout Spirit.
Tenderfoot
 
Tenderfoot is the second rank. A Scout can work on the requirements for the Tenderfoot, Second Class, and First Class ranks at the same time, but each rank must be earned in sequence. The badge is awarded when the Scout completes requirements in the areas of Scoutcraft, physical fitness, citizenship, personal growth and Scout Spirit.
Scout
 
Scout is considered the first rank, and is earned by after joining the boy scout troop. The Scout badge is awarded when the boy demonstrates a rudimentary knowledge of the Scouting ideals such as tying a square knot and knowing the Scout oath, law, motto, and slogan
Scout Rank Requirements
Tenderfoot Rank Requirements
Second Class Rank Requirements
Life Scout
 
Life is second-highest rank attainable, awarded when the Scout serves actively in the troop, serves in a position of responsibility for six months, and performs six hours of community service. The Scout must also earn an additional five merit badges (three of which are required for the rank of Eagle), to make a minimum total of eleven merit badges (including the six previously required for Star). Finally, the Scout must pass a Scoutmaster conference, and board of review.
First Class
 
The badge is awarded when the Scout completes requirements in the areas of Scoutcraft, physical fitness, citizenship, personal growth and Scout Spirit. At this point, Scouts stop practicing the Scout skills, and start working on leadership. Ranks from here forward form a second tier where Scouts can further develop leadership skills and explore potential vocations and avocations through the merit badge program.
Star Scout
 
This is the third-highest rank. Star is awarded when the Scout serves actively in the troop in a position of responsibility for at least 4 months; performs at least six hours of community service; and earns six merit badges (four of which must be required for Eagle Scout rank). Six merit badges are required for Star Scout.

First Class Rank Requirements
Life Rank Requirements
Star Rank Requirements
Eagle Scout