“It is better to say a small amount of supplications with intention (kavanna) than to recite many without” – Shulchan Aruch 1:4. “What is important in the eyes of Hashem is that one puts forth his full effort.” Mishna Berurah 12. “Whether one does a lot or a little, it is important that one’s intentions are solely for the sake of Heaven.” – Menachos 110. (These statements apply to Torah learning as well.)
The Mishna Berurah (9) says that the first thing one should learn following Tikkun Chatzos is Mishnayos. The sefer Likutei Amarim (quoted in Dirshu MB #24) writes that “Every person should be careful to learn the entirety of the six orders of Mishnayos; each person according to his level of understanding, as within the mishnayos the entire Torah is contained. Moreover, one will certainly be asked regarding this, upon reaching Heaven
after 120.”
