Swara Shuddham means pitch – perfect
When we start learning music we are taught to sing Sa – Pa -Sa in unison with the tambura.Then we learn to sing the 7 notes
Swara shuddham refers to the singing of every note in pitch . Who can tell you if you are right ? The best person would be your guru. Nowadays there are many apps also available to help you see for yourself if you are in pitch or not