Your most efficient review won't happen using the SRS Review system. In fact, seeing your LingQs again in future lessons or, when you re-read or listen to the current lessons is a more efficient and effective means of review. And, more enjoyable if you have interesting content! Every time you click on a LingQ in a lesson is another review of that word. Most of your review will happen naturally this way. The main thing is to make a lot of LingQs and keep moving. The words that matter will reappear in future lessons.
 
If you want to do some review using the activities, go ahead. Sometimes it's nice to mix things up. Or, if you have words that give you trouble, give these a special tag and then filter for those words on the Vocabulary page so you can review those using the activities. The big thing is not to try and drill every word into your brain. Your brain will learn over time. After a month, if you return to the first lesson you did, you will be surprised at how well you now understand.