How to Practice Odd Time Signatures on Drums
Break the odd meter into smaller, familiar groupings before you try to feel it as a whole. 7/8 becomes 2+2+3, 9/8 becomes 2+2+2+3 (or a variation), and 5/4 becomes 3+2 or 2+3. Practice each grouping slowly until it's a phrase, not a count, then loop it against a real track rather than a bare click.
Odd time signatures have a reputation for being difficult, but the difficulty is mostly front-loaded. 5/4 and 7/8 aren't inherently harder to play than 4/4 — they're just unfamiliar, so your brain defaults to counting every subdivision out loud instead of feeling the phrase the way it does automatically in 4/4. The fix isn't more counting. It's getting past counting as fast as possible.
Break it into groupings you already know
Nobody feels 7/8 as "one-two-three-four-five-six-seven" for long — it collapses into smaller chunks almost immediately, usually 2+2+3 or some rotation of it. Same with 9/8 (commonly 2+2+2+3) and 5/4 (commonly 3+2 or 2+3). Pick a grouping, practice it slowly enough that each chunk feels like its own small phrase, and the meter stops being math and starts being music.
Loop short sections instead of playing the whole thing end to end
Trying to hold an odd meter for a full four-minute piece before it's internalized just means restarting from the top every time you lose it. Loop a single bar, or two bars, until the grouping is automatic — your hands and your sense of time need repetition on the small unit before the whole phrase holds together.
Play along with a real groove, not just a click
A metronome will tell you where beat one is, but it won't give you anything to lock into musically. Practicing against an actual recorded groove in 5/4, 7/8, or 9/8 gives your ear something real to follow, which tends to get the feel under your hands faster than counting along to a click in isolation.