Good morning. I am coming close to the end of the LR study guide, so I wanted to know if I should do a preptest now or wait until I have done the LG and RC guides as well?
There are plenty of prep tests, so you should take them often. If you haven't taken one at all yet, definitely take one as soon as possible. But while you're studying, it's normal to take on a test or two every week, so there's no need to be stingy with them. There are dozens and dozens by now! : )