If you are entering Spanish I in the Fall of 2018, here's what you can do to give you a head start:
Duolingo – Get as much practice as possible: https://www.duolingo.com
StudySpanish.com - Basic grammar covered during the first few weeks of class.
If you have completed Spanish I and will begin Spanish II in the Fall of 2018, you need to keep your Spanish ‘alive’.
Quizlet - You can find any subject by typing your textbook name and the topic or chapter that you are looking for. For example: “Avancemos 1 direct object pronoun”
Duolingo - https://www.duolingo.com
Avancemos 2 Online Textbook - https://my.hrw.com/hrw/my_hrw_teacher_hub.jsp