How is rakesh aggarwal sir for ca final costing new syllabus ?

not so good . go for other faculty as he does not cover theory in classes

i will not recommend him rather i will suggest you to refer icai material and study yourself.

mat lena bhai hum liye the achche nahi he. old syllabus ke pattern pe padha diya sab koi fayda nahi hua class lene ka

choose between Sanjay Aggarwal or Purushottam Aggarwal. i have heard good reviews.

i have watched demo but didnt liked that much. i think for new syllabus you should look for good refrence books along with icai study material and refer RTP MTP PAST YEAR PAPERS

I will suggest Parag Gupta sir's classes as he covers both theory and practical in his classes and his classes are updated as per the new updates of ICAI. His classes are newly recorded and also provide hand written notes and homework videos for self studies.