It's certainly possible for you to complete level 1, and even most of level 2, before the April bootcamp, which would then put the cherry onto a particularly impressive cake, and make you a Welsh speaker after only about 6 months of learning. You'd need to do 2 challenges a week between now and the start of bwtcamp, you'd be about half way through level 2, and have plenty of Welsh, and a huge momentum, to really enjoy yourself.
The best thing to do if you are considering that is to try it between now and the 12th of January (4 weeks), and if you have done at least 8 more lessons in 4 weeks time than you have now (preferrably a couple more than that), then you might seriously consider paying your money and coming on bwtcamp. After all, if you're going to become a Welsh speaker, you might as well become one in April rather than wait til later!
The counter-argument (and the contra-indication) is that you will find yourself under quite a bit of pressure if things don't go to plan, which will cause you problems if you don't react well to the pressure. you could end up hating the process, which isn;t a good way to start a bwtcamp! Have a look at the last point of the FAQs that I put up on the 2018 Bwtcamp page earlier - it will give you a better idea of what level of Welsh you will need, and whether you are confident that you can reach it.
I know that you can reach it, is whether you will enjoy the process, and whether you will get the most out of bwtcamp that concerns us here!
Just to add, there will be more bwtcamps over the year, but I'm not 100% as to when at the moment.