RCIA preparation classes have two parts. The first, for the unbaptized, is Breaking Open the Word. The catechumens are dismissed from Mass after the readings and homily, and go with their catechists and sponsors to another room, where they spend more time exploring the meaning of the readings, and hopefully applying them to daily life and showing how the content of the scripture readings leads to the formal doctrines of the Church.
The second part can be on the same day, or another session during the week, and is catechisis on Church doctrine and practice. It should be based on the structure of the Catechism, focusing on its 4 pillars: the Creed, Liturgy and Sacraments, Moral Life in Christ and Christian Prayer. If you have not already been given a bible and a catechism, find out if they are going to be made available to you. If not, purchase your own. In any case, the material presented in class is supposed to be the foundation and jumping off point for your own self-study and spiritual reading. You cannot hope to get it all in a weekly class.
For practical purposes, both candidates (baptized adults needing confirmation and/or 1st communion) and catechumens (the unbaptized) may take the same classes, since they essentially are learning the same things. The actual Rites they celebrate will be different so as not to deny the special status of the baptized.
Ask lots of questions, and politely ask to be directed to where in scripture and the catechism you can go to read more about the topic.