Regarding the two books you have mentioned, Sri Ramacharitamanasa by Goswami Tulasi das is not very authorized, and Ramayana is authorized. One thing is though, you have got enough other books to study. Did you appear in the examination held on Janmastami Day? Why should you go to Ramayana when you have got Bhagavad-gita, Srimad-Bhagavatam and Teachings of Lord Caitanya? Don't divert your attention in that way.
Letter to Raktaka, 6 September, 1969