When teaching young students We usually
• Teach Humash [or Tanach] first
• Then we proceed to Mishnah
• Then we proceed to teach Bavli and Rishonim - such as Rashi and Tosafot.
• Why do we bypass Tosefta?
• Why do we bypass Yerushalmi?
IOW Shouldn't we cover the texts in chronological order?
Illustration of chronological order: