1) the 1st digit of the square of the second digit

Question

2) the sum of the 2nd and the 3rd digit is 4
3) if the 4th digit is equal to 2nd digit plus 1
4) if the 3rd and the 5th digit are 15
5) the sum of all the digit is 30
i.e when you add all your workings it should be giving 30?

Answer 1

1) must be among
11xxx
42xxx
93xxx
2) That means we can have
113xx
422xx
931xx
3) Next, we could have
1132x
4223x
9314x
4) Next,
93145
5) These digits sum to 22
Maybe you can find my mistake in interpreting your clues.