Translations

Hello !
Could you tell me if these sentences with present perfect are correct ?
1.I have sat 2 exams lately.
2.He has just peeled an apple then he has chopped 2 carrots and he has mixed them to make a salad.
3.I have given up buying leather coats because it is very expensive for me.
4.I have read only magazines lately whereas my sister has read two novels written by Charles Dickens.
Could somebody help me to make a sentence with the word ‘to jeopardize’ using present perfect because I don’t have any idea.

Thank you a lot for your support!

2.He has just first peeled an apple then he has chopped 2 carrots and finally he has mixed them to make a salad.
You need to provide the order because your use of the same tense throughout doesn’t help to clarify the order of events the way in which these sentences would:
He peeled an apple, then he chopped two carrots and he has mixed them to make a salad.
He has peeled an apple and chopped two carrots which he mixed to make a salad.
However, all the versions are correct.

The other sentences are okay.

I have jeopardized my chances of passing the exam because I have not worked hard enough.