At least once we're grown, IQ is not something that can be successfully raised any more than we can change the distance between our eyes or our height.
From what I have read, IQ is about eighty percent heritable and twenty percent environmental, at least during the time when humans are developing. Heritable means it comes from our genes, and there is nothing that can be done.
The following is the case in most developed countries: Look at the ingredients list of a prepared food item. If that food item contains enriched flour, law mandates that the flour be fortified with iron, riboflavin, niacin, and a couple of other nutrients. This is because without these nutrients, IQ and neural development are inhibited, and sometimes severely so.
Another factor that can raise IQ in the developmental years is providing a stimulating environment for the child.
So, if you are grown, there isn't much you can do about your IQ. But you can make the most of the abilities you have by studying hard, and you would be wise to do so.
Finally, I would add that an IQ of 101 is a little above average (the test is renormed every few years to ensure by definition that a score of 100 remains average.
Good luck.