Start Your Engines: The Chūnin Exam Begins!

is episode 24 of the original Naruto anime.

Synopsis
At the beginning of the episode, Ibiki Morino appeared and told everyone to find their seats. Ibiki announced that the Chūnin Exams would start with a written test, and called out the rules: no questions, and no cheating. Ibiki also informed that the team's score would be added up in the end to see whose team would pass. There were various chūnin on the ends of the room watching the genin to see if they were cheating. If they were caught cheating five times the genin and his/her team were all disqualified. Eventually everyone, except Naruto, found out that in order to pass, they had to cheat. They then used their own ways to subtly cheat.

Cheating Methods

 * Gaara: Blows sand into another candidates' eyes and uses his Third Eye to read their answers while they're distracted.
 * Kankurō: Disguises his puppet as a sentinel and uses it to view other candidates' answers, then goes to the bathroom with the false sentinel to read what the puppet had seen.
 *  Temari: after Kankurō goes to the bathroom, he writes the answers on a small scroll and sublty passes it to her.
 * Kiba: Uses Akamaru to read the other candidates' answers.
 * Shino: Uses a bug to read the other candidates' answers.
 * Hinata: Apparently did the test without cheating, although it is also possible that she used the Byakugan like Neji.
 * Tenten: Uses wires to adjust the flaps of a ceiling lamp, to view the reflections of other candidates' answers and pass them on to her team-mates.
 * Neji: Uses his Byakugan to see through another candidate's body and read his answers.
 * Sasuke: Uses his Sharingan to mimic the writing of another candidate.
 * Ino: Uses her Mind Body Switch Technique to view Sakura's answers.
 * Dosu: Listens to the patterns in the sound of a writing pencil and deciphers what is being written.
 * Naruto: Hinata lets him copy hers, but in the end he doesn't cheat, fearing that he'll get caught.
 * Shikamaru: Ino used her Mind Body Switch Technique in him to write the answers after reading Sakura's.
 * Chōji: Ino used her Mind Body Switch Technique in him to write the answers after reading Sakura's
 *  Rock Lee: Tenten used wires to adjust the flaps of a ceiling lamp, to view the reflections of other candidates' answers and pass them to Rock Lee.
 *  Sakura: Did the test without cheating.