SSC CGL is a objective based examination where as the Civil Service examination don't have that kind of problem solving skills required. In prelims you will get objective question but for that you have to study comprehensive GS. SO it might help you a bit, but for civil services preparation for it distinctively is required. The students, who appear for the Prelims usually prepares for the Mains and they get the things out of it, so competing with them can be hard for you, but if you work hard in studying both the examinations along side, then it would be beneficial for you.

For preparation tips regarding SSC CGL you can follow:

https://competition.careers360.com/articles/how-to-prepare-for-ssc-cgl

For preparation tips regarding the UPSC CSE, you can follow:

https://competition.careers360.com/articles/how-prepare-for-upsc-ias

I hope this helps. Have a great eve!