Tips for training:

Hi! I have a question about training. I have one month to make some progress and don't know if it's possible.

1. I made 40 pushup's but I need to make it 60-70
2. I swam 525m. in 12 minutes but I need to make it 575m.

Is it possible to made it in 1 month without gym? Just swimming and pushup's at home? I went once to swimming pool and I was doing pushup's like 70-80% of my maximum (1min break) and then again 70-80% (break, pushup's , break) to the moment I couldnt do more.
Thanks on advance!