Pauker can import Lessons from different sources. The supported fromats (CVS, SSV and TSV) are shown in the file chooser when opening a lesson (see fig. 5). Because Pauker can not (yet) guess the format of the lessons you want to import you have to specify it correctly.
The lessons you want to import can be encoded in many different ways. The formats Pauker supports can be selected in the filechooser, too (see fig. 6).
If you want to merge two lessons you have to open the first one just normal and activate the button ''merge lessons'' when loading the second one.