Hi,
You can just add new or modify your existing schedules to include material from other levels, Below a step by step for creating a new vocab schedule including N1 materials:
1) on your dashboard, click "Study Library"
2) Click on Scheds on the left side
3) Click on Make a schedule, select Vocab and enter an appropriate name
4) Click on Add study materials
5) Search for "JLPT N1" or click JLPT and find the N1 lessons by renshuu.org
6) Click on "Schedule all" to add all or on "View Lessons" and select the first few to add to your schedule
7) Click save and have fun learning N1 Vocab :)
If at any point in time you want to add more materials (additional lessons or completely new topics) to an existing schedule, click on "adjust +/-" from the correspondings schedule screen and you will be taken back to the same screen you saw at step 5) above.
Tip: if you want to add new lessons for an already included topic, you do not have to search for it again, but can rather click on "In schedule" on the left hand side and add individual lessons for the already included topic from there as well :)
Kanji and Grammar schedules are created/maintained by the same method, although the lesson selection for grammar is slightly different.
I hope this answered your question :)
