Archive your last year's classes in folders
From the list of classes > 
> Folder
Add a new schedule for this year
From the calendar view Select calendar and Add a new one.
Once you create the new calendar you will be able to configure the new weeks/cycles for your new term from the schedule or this very same calendar view
Copy a full lesson plan to another class
In order to copy a plan from last year you must configure the calendar for the new year first.
Once configured, open the source class and go to the Diary > Tools (top bar).
Select the the dates to copy from, the target class and the first date you would like to copy the lesson plan to. By default it will copy all resources as well.
Create new classes based on previous ones
From the list of classes > Options > Copy to create a new class based on the previous one. Select students,columns, data or a combination, more details explained here
Import students from XLS, XLSX or CSV Files, the import Wizard
The import wizard embedded in iDoceo will make importing data a breeze.
There is no need to edit students files or headers anymore just 'Open in' iDoceo from the app holding the file (Dropbox,Mail,Google Drive) and select 'Import wizard'. You will find a quick step-by-step here
Related articles
Copying a class structure, with or without students
Move students to another class