现在我们周围的环境污染越来越严重。作为一个中学生，我们应节约资源，保护环境，从我们身边的小事做起，做一个“低碳生活”的中学生。请以“My Low--carbon Life”为题，写一篇短文描述自己的“低碳生活”。

Please explain “keep on top of his finances” in this sentence: He said he was going through a hard time having split up from his girlfriend, started taking drugs and had “failed to keep on top of his ...