yes, u can reach level B1 in a month. its getting to level C1 which seems to take forever after you get to B1.
If i could recommend only one thing, it would be to learn as much vocabulary as possible.--- And here is the thing that is a great help. English and spanish have a lot of cognates (same words basically). as far as grammar, study just basics, that will come later. Plus grammar is a "sounds right" kind of thing. let your ear learn over time what sounds right. DO AS MUCH LISTENING TO NATIVES SPEAKING AS MUCH AS POSSIBLE.
here are some links to some awesome material.