I urgently need you to check these sentences on the present perfect. Thank you.

1) I've just come back from the studio where we were rehearsing/practising(exercising/training are mistakes?).Is "we practised" possible?
2) I still haven't spent my time listening to music.
I haven't had an oral test yet.
3) I haven't been tested orally in maths yet.I haven't done a Latin written test, yet.I've already gone to the bathroom.
4) I still haven't eaten an ice-cream (or just ice-cream).I still haven't downloaded any songs (not song) yet.
I have already done the shopping with my mum.
5) I still haven't had a maths lesson.
I haven't caught the bus yet.
We have just released (is "shot" possible?).
6) I've already gone online shopping.
Last week we did/had/went for (conducted is a mistake) an interview for a music (is "musical" acceptable?) magazine.
7) I still haven't revised for my oral test.
I've already helped my mum cook breakfast.

1. All the variations are possible, but I wouldn't use the simple past. This is an action that needs past continuous.

2. OK

3. Space needed after each period. It'd be better to have "written Latin..." (reverse the order of the words).

4. I still haven't eaten an ice-cream cone. I still haven't eaten ice-cream. I still haven't downloaded any songs yet.
I have already done the shopping with my mum.

5) OK

We have just released (is "shot" possible?). <~~I don't understand this one.

6) I've already gone online to do some shopping.
Last week we conducted/had an interview for a music magazine.
You'd use "conducted" if you were doing the interviewing. You'd use "had" if you were being interviewed. You'd use "music" if the magazine is about music. You'd use "musical" if the magazine sings to you!

7) I still haven't revised _____ for my oral test. Or do you mean you reviewed for the test?

OK

1) The sentence "I've just come back from the studio where we were rehearsing" is correct. "Rehearsing" is the appropriate word to use here, as it means practicing or going through a performance before the actual event. However, "practising" (with an "s") is also correct, as it is a variant spelling of the same word.

2) The sentences "I still haven't spent my time listening to music" and "I haven't had an oral test yet" are both correct. The present perfect tense is used to talk about actions or states that started in the past and continue up to the present, or have just been completed.

3) The sentences "I haven't been tested orally in maths yet" and "I haven't done a Latin written test yet" are correct. The verb form "haven't" is used to express the negative form of the present perfect tense. "Orally" and "written" are adjectives that describe the type of test.

4) The sentences "I still haven't eaten an ice-cream" and "I still haven't downloaded any songs yet" are correct. In the present perfect tense, we use the past participle form of the verb. "Ice-cream" is a compound noun, so there is no need for an article before it.

5) The sentences "I still haven't had a maths lesson" and "I haven't caught the bus yet" are correct. The present perfect tense is used to talk about actions or states that started in the past and continue up to the present, or have just been completed.

6) The sentence "I've already gone online shopping" is correct. The verb form "gone" is the past participle form of the verb "go" which is used with the helping verb "have" to form the present perfect tense.

7) The sentences "I still haven't revised for my oral test" and "I've already helped my mum cook breakfast" are correct. The present perfect tense is used to talk about actions or states that started in the past and continue up to the present, or have just been completed. The verb form "haven't" is used to express the negative form of the present perfect tense.