If there is no answer from the HR after review, what could it mean?

Should I mail them back, asking for updates?

@user24454 how long after? what do you mean by "review" ?

@enderland 1 week, this company hired me as a trainee, said we will conduct a review after 6 months and see if you are fit for internal positions. Now as review, they gave me a sheet to rate my performance on various factors. The same sheet will pass on to my supervisor and the manager.