Our consideration is on the workload of Science as a subject relative to Math as a subject, based on MOE curriculum guidelines. The other consideration is what is the right amount of work daily (across different subjects), we do not want to stress out children by imposing an excessive daily workload. Therefore, we reduce the daily challenge workload and the peer challenge workload on a daily basis to maintain the children's motivation level and sustainability of learning (multiple subjects) on the KooBits platform.