Then start with kneeling push ups, or wall push ups do 2-3 sets to failure every other day and you'll see improvement in no time!
Sounds like you're getting ready for a PT test or something. The best advice I have is take the test you are looking to pass every other day, but don't just do the minimum. Push yourself until muscle failure for push ups and sit ups or do as many as fast as and as much as you can in the one minute. As for running, try to run hills and keep that max time that allowed or under and run 2 miles instead of 1.5. Remember to push yourself on this. At the end of your run you shouldn't be able to hold a conversation. If you keep like that you should be able to complete that 1.5 mile in 9 minutes
True. Something that helps me with push-ups is to push down through the bottom part of my Palm (the meaty bit at the bottom of my thumb) rather than through the top bar where my fingers join. Helps with the transfer of power. Another thing. I have seen plenty of fit people not get into outfits after fitness tests because their attitudes haven't been any good whereas those who are so so fit have gotten through because they don't quit. Keep up the motivation and effort