Qualification - CA + CA

Good Morning

Have 3 queries . Can anybody please clarify ? 

1 ) Can i do B.Com + CA + CS Together ?

2 ) If I finish articleship under CA, under the new law , is it mandatory to do 2 years articleship again for CS ?

3 ) Alternately , If i work post CA for 2 years in an organization , will that experience qualify for gaining exemption for CS Articleship ? 

Regards