Most of the students of social work love to do field work practice in child development field or working with children. There are plenty of NGOs in India doing the projects for the betterment of children especially for underprivileged or mentally retarded children. There are numbers of juvenile homes also.
So while working with the children, you need to observe them about their interest.
If you love to play with the children, you can observe his interest and team work during the play. You can also observe the developmental level and his strategies while playing games with him. You can also check the skills he used and also his personality.
Like playing ludo with him, you can find about how he makes plan and how was his attitude during the play.