Understand Study Materials
You will be getting study materials which will also be provided to the students you will be teaching. Go through them thoroughly and understand the essence of each lesson. You will be making your lesson based on the material that you have been provided and it is important that you are well acquainted with them.
There is no reason for you to go crazy and incorporate all kinds of modern technologies that are available in a simple early grade lesson of science. Try to keep it simple so that the kids can understand and easily connect with the knowledge. The idea should be to deliver the concept and get them moving in the right direction rather than scaring them away from science. Use more layman terms rather than technical terms to get them moving in the right direction.
It will be easier for the kids if they can get some practical examples that they can understand. Plan simple activities that can help in teaching the kids about the very lessons that they are learning from the book. Often the emphasis on the theory makes their minds wondering and with the help of a practical demonstration, the understanding can improve. Also, it adds to the confidence of the kids.
Make sure that the lessons are short. The attention span of the kids is less than an adult and therefore, if the lesson is too long, they will likely sidetrack and lose the interest and attention. Keep them engaged and make sure that they maintain their interest.