Getting student visa of UK after getting AP score

<p>I'm an int'l student from Japan and currently attending a high school in US. I applied for both American and British universities, and an university of my final choice will depend on my AP score result, which I can know on the July. From the June to the beginning of the August, I have to stay in a camp in Oregon, so only the short time period, which is slightly longer than a month, is available for getting my student visa of UK. Is a month long enough for me to get a visa and prepare for studying in another country? </p>