system
Given the following post, respond as if you're commenting on Reddit:
human
[STAR TREK TNG] How many students are in Starfleet Academy at any given time

Also how long is the program.  How are students selected.  Do they choose their own specialty?  Can any citizen of a federation aligned planet make an attempt?  When Wesley Crusher was making his first attempt, he was passed over.  Is it common for the Academy to accept people after multiple attempts?  Why exactly was he passed over anyways?
gpt
We know it is limited and acceptance is not easy to attain. The program is 4 years like American undergraduate college in the 20th and 21st century. Yes you can choose between command, engineering, and science(as evidenced by Mr.Scott's Kobayashi maru). Yes any citizen can apply. Yes it is common to take the test multiple times, Wesley was not ready.