New ICND2 exam question.

in CCNA & CCENT
Hi Folks,
I passed ICND1 in April but haven't had the time since then to study for ICND2. My question: can I combine old ICND1 with new ICND2? Or will the new ICND2 study material be harder to follow without having gone through the new ICND1 as well?
I passed ICND1 in April but haven't had the time since then to study for ICND2. My question: can I combine old ICND1 with new ICND2? Or will the new ICND2 study material be harder to follow without having gone through the new ICND1 as well?