What are A,B,C,B1,B2,S,TS,Z grops on BSE?

#1
Hi,

I wanted to know how companies are classified in the above mentioned groups. Also I have heard that investing in Z group companies is risky and the trades in T group companies are settled on trade on trade basis. Can you explain me more on that and whether is it advisable to invest in them? Also I am not too clear about S group companies. Are they as risky as Z group or investing in them is not a problem?
 

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