I wasn't aware of any previous posts nor do I investigate every new member on this forum.
Firstly, the OP is not a new member and has posted here before and if you had bothered to read the first two sentences of his opening post, you would know this.
So in order to :
offer advice based on experience
I read the previous comments written by him to see what in the way of advice was offered to him before. Logical thing to do and it hardly constitutes an investigation does it?
The point I was making is that the OP had started to learn Polish 3 years ago, but clearly didn't keep it up as he says he is about to start learning Polish.......again. That does not sound like someone committed to joining the army and given that he said he was 23 when he first posted, he would now be 26, so by the time he has become proficient in Polish he is going to be pushing 30.
I don't know what the upper age limit is for joining, but I would have thought they want to train them from a younger age than that. I think with the volunteer force it's different though, and they accept older candidates, maybe that is the best way forward for him.