For back handsprings:
- It is easier (for me and most people I know) to get it standing first and then practicing connecting it to a roundoff with a spot after you are comfortable doing it by yourself
Drills I liked doing when I was learning a BHS was
- Doing it over an octagon mat
- Doing it on a resi mat (though I feel like it was harder to transition to the regular floor from that mat)
- Back limbers (back walkover but you kick both legs over at the same time, when you get more comfortable with back limbers, you can try doing it with the arm motions and a little jump before it)
For kips/glide:
- See if your coach can raise a low bar a bit
- Try to pike your body more when you jump, and then extend once your hips are more on the other side of the bar, then bring your shins to the bar and shoot then towards the ceiling
- It could also be that you don't have a lot of core strength, which helps with glides and kips
Many drills that my gym did to get kips did not help me, but here are some drills my gym did
- tying a band to each end of the low bar and placing out feet on it to work our glide and kips
- placing two blocks about hands width apart, sit in a pike sit, lay back with your hands on the block, and practicing rolling to that pike sit and lift your butt off the ground with your arms to work on keeping your arms straight when you pull up onto the bar at the end of your kip
Sorry for a longer post, But I hope it helps and good luck! (if you are confused about any drills, I will try to attach videos later, I ran out of time to find then right now)