It’s good if you search it by your own in Google … But if you want to check it through tools then their are many tools out their for free . Seobook [dot] com provide their free tool for searching your keywords ranking .
May be last summeuri can give you previous week data for analysis. Through seobook rank checker you can not get previous week or month data. But you can make some excel file or word file and make your own data analysis.
there is another tool/provider, where you can check keywords and ranking positions … there is a free access but it´s limited to maximum 3 domains and 5 keyword-monitorings…
Try Rank Checker from seobook.com. It allows you to find region specific ranking(Google). Its result will be more close to manual checking. This tool also provides your ranking in Yahoo and Bing.
This one can track history so you know how well you are doing over a period of time. You need to register to be able to use that tracker. Sign up for free I meant