In Jesus' conversations with Nicodemus the Holy Gospels were not mentioned because they had not yet been written
They were written after the Resurrection of Jesus, about 40 years. The first written gospel is that of St. Mark around the year 70
So Jesus prayed with nothing of the New Testament, himself being the incarnation of the Gospels
And from the books of the Old Testament there are many of them with which Jesus could have prayed, but which ones in Papyrus there would be in the Synagogue of Jesus or what was recited?, or which fragment would he choose?, we do not know. We can assume that of the first five books of the Bible there would be copies of: Genesis, Exodus, Leviticus, Numbers, and Deuteronomy. This set of 5 books is called Pentateúco
With what Jesus sure prayed was with the 150 Psalms:
https://www.catholic.org/bible/book.php?id=23&bible_chapter=92
(Link to all the Psalms)
From "Swan Lake", a Swan
among 150
And surely this Psalm that is for Saturdays could be one of his Favorites that begins like this:
Psalm and Canticle number 92-91 For the day of Saturday:
2 It is good to thank the Lord | and touch for your name, O Most High; 3Proclame thy mercy in the morning | and at night your fidelity, 4with ten-string harps and lauses, | about arpeggios of cítaras. 5 Your actions, Lord, are my joy, | and my jubilation, the works of your hands. 6O magnificent are thy works, Lord, | how deep your designs!
The Psalms are a set of 150 Songs. So surely you will find one that in a certain circumstance can help you transmit to God what you desire: Praise, prayer, non-conformity, joy, singing, etc...
Especially because they help to express, what you are feeling
to move it to God with 😀😀