Some good questions Seerat,
1. You can write it both ways, just make sure that July is a capital ‘J’ otherwise you will get it wrong
2. Yes you can write ‘4 years old’ but the more complicated the answer the more chances for mistakes. Also, make sure the booklet does not include ‘years old’ or it will be wrong
3. Yes, write it as 2500-7000
4. Yes, it is often the safest to write all in upper case letters; however, it is easier to make spelling mistakes this way, so you do need to be careful.
Keep up the good work.