How do you stop my kid crying to go school?

You can encourage the kid: 'School will be fun!', ' You'll learn so much!' You can also promise them things you will do together after they get back from school: 'I'll come pick you up after school,' ' We can go to the park,' Also, give them something 'special' to hold on to. A small key chain, sticker etc. and tell them that 'whoever' will be with them!