Need Advice...

Yes  you can pursue cs with ca by submitting 112.  If you have made your mind about CS and are ready to work a bit hard to pursue both degrees then there is no need to wait for PCC result.

At least at inter level and for theory subjects module will be enough.  For Direct tax you can refer book of Bharat publications or of Taxmann publication.  For Indirect tax you can refer bangar's book or ajay jain's note (although even for IDT i think module is enough).  For accounts you can refer books which you have referrred in CA Pcc.

Subjects in first group are - 1 General and commercial law; 2 Company/cost/Mgt. accounts; 3 Tax laws

Second Group            4 Co. Law     5 Economic & Labour Laws     6  Security Laws & Compliances

For fee structure refer following link

https://www.icsi.edu/webmodules/linksofweeks/REVISION%20OF%20FEES.doc

For centre address select your city in following link

https://www.icsi.edu/webmodules/homepage/map_icsi.swf

For details on the course refer following link of CS brochure

https://www.icsi.edu/webmodules/student/Brochure/CS%20Brochure%20for%20Regular%20Course.pdf

If you register before 28 Feb, you can appear for both groups of executive programme in december 10