I go to a protestant school, more like a school that welcomes all Christians and not just protestants, and I participate in their worship services. Can I, a Catholic, receive the protestant communion?
There are rare exceptions that can be made for Catholics who do not have access to a Catholic church or minister but this would only be for Churches that have a valid Eucharist (e.g. the Eastern Orthodox Churches). The Church does not permit intercommunion under any circumstances with Christian faith communities that do not have a valid Eucharist (canon 844 §2).
Simply being at a Protestant liturgy does not meet the standard necessary for the exception to the prohibition of intercommunion.