Go as heavy as you can with all the exercises you do with as many reps as possible. There is a misconception that lighter weights make one leaner. In fact, heavier the weight, harder the effort = more calories burnt.
I would recommend quite a different plan. You are doing 50 reps each in 4 sets of crunches, this means your abdominal engagement is lesser than you can think. All the work is being done by your hip flexors and unfortunately your neck is getting a pounding.
Divide your days of working out. You will not and I repeat, not go to the gym for more than 3 days in a workout week. A workout week means the total number of days you complete your routine with rest days included. Go for running outside if possible. That engages your body more than on a treadmill. When you go to gym, try to do crunches while contracting your abdominal muscles rather than just lifting your body up with a jerk. Do a controlled lift of your body while you feel your abdomen getting knotted into a bag and while coming back, control your movement very slowly with releasing your abdominal muscles. Go all the way down without letting the abdominal muscles relaxed. Try it with full honesty and I bet you can't go over 15 reps in a set. When you do exercise (I think by inclined you meant a declined bench) on a declined bench, do the same controlled movements and I think as many as 5 reps would kill your abs if done honestly.
Now you will go one day to the gym and exercise the next day at home. Now be very honest about the workout you do at home. It will be simple but a killer. Have you ever seen people swinging arms in P.T classes? Yes! I want you to do that. First warm your body up by little jumping, some arm swings and some squats, yes bodyweight squats.
Now you will start arm swinging sets. Start with forward arm swings with 35 reps and as the set progresses, your speed should increase so much that you need to lift your heels in order to keep your balance. Now right after it, go for the reverse arm swings. 35 reps in it too and with full speed. Rest a little, like 30-45 seconds and go for bodyweight squats as many as you can with full force (it would be better if you do those desi squats like pehlwans while lifting your heels up and letting the arms go to sides). If you find squats difficult, get a bench or a stool but then you will have to do as many as your breath doesn't allow. Rest for 30-45 seconds, go for arm swing sets, this time they should be fast from the beginning so much so that you feel strain in your palms. Go with arm swings and squats till 45 minutes without resting much. 3rd day is rest day. Go for gym after rest day and then the arm swing day. Eat egg whites after gym and home exercise, (3-4 at least, more if you can). Take plenty of water. Do this for some time because it will make your arms and shoulders sour at first and I will tell you the rest after you get really good at it.
