It sounds a bit difficult in this situation I’d say, I passed N3 in July and had to study a lot of vocab outside of WK (and that was still not enough) to barely pass N2 in December. I wrote a bit more in these posts so you can check them out
It also depends on your speed with reading, vocab and your listening comrehension too. I’d suggest going for solid N3 this December and for N2 in summer, but I don’t know if you’ve registered already xD
