There is no as such online coaching which gives you 100 percent results so it is difficult to suggest any one name at the end its your efforts and hard work matter but one thing for sure i suggest don't go with big names but choose the right names who gives proper guidance for ssc cgl and chsl.

Choose faculty who are really good in their subjects and have years of experience in this field. Explore coaching and review of past students they will help you better.

Also here are the preparation tips to help you prepare better:
https://competition.careers360.com/articles/how-to-prepare-for-ssc-chsl
https://competition.careers360.com/articles/how-to-prepare-for-ssc-cgl

Good luck..