IQ, or learning capacity is usually inherited........
even though it can be changed by enviromental factor....
well, do more academic exercises, read more books, don't be lazy, have a balanced diet......that's all
be open to accepting all new information. read. watch discovery channel. read a dictionary cover-to-cover. use www.wikipedia.com and select a random page and read it all.
increase your knowledge base and analytical thinking. study, read a lot, take lots of IQ tests AND review the answers. you won't increase your IQ by much when taking official standardized IQ tests. but it'll increase nonetheless. good luck.