Best would be to consult a clarinet teacher who can gauge exactly what's appropriate but here are some suggestions.
Consider the Voxman collection recently discussed here: Finally! A Voxman "Concert & Contest" CD http://amzn.to/2oqUMxD
and take a look at Solo de Concours for Clarinet and Piano
for purchase here http://amzn.to/2oqV6MR