How to become fat in a month?

Can you please give us more information.
How old are you? What is your hight and weight now? Why are you planning on getting fat?
I do find it weird that you are asking such a question. This is no insult but more information well be a great help to salving this problem. I look forward to your reply.

Your own body's metabolism may be preventing you from retaining excess fat.

You should consult a dietician and/or your doctor. Be careful, please.

Once again I will have to agree with the CaptainRich. Really good advise.
You should consider this option.

If you want to gain a few pound you simply have to eat, especially in the morning, and not miss any meal for that matter. As for getting fat in a month, I won't give you advice for this. It would be like someone wanting to lose 100 lbs in a month, it's just not the right thing to do to your body. You can bag up cereals, or granola, fruit, nuts, seeds or yogurt and eat them during the day, even though your have a hectic schedule. Get up earlier before school starts and eat, Is the best advice I can give you.

Dear dmiseall,
Sister I am also a person from trivandrum,21 years of age,studying at a college.I too face similar problems.I also have similar specifications like you.As a guy I face challenges in my height also..I am just about 160 cm.Friend let me firstly tell you that this height or weight mostly depends on your parents.That can never be changed easily.I am telling this because I am a non veg and in most of the days I eat chicken(almost all)and drink milk..Yet I am not getting fat.Then these days for more body developement the guys use protein powder and such things.I don't know whether it is good for the body.Well dear friend reply to me if you have any suggesions in increasing fat.Then dear don't be afraid becoz ..as the generation is proceeding the children are getting more taller than their parents and all na..?So this might just be a natural happening.Slim girls are also attractive ..ok?So don't be afraid friend reply..

There is a world of people who are overweight -- eat like we were running out of food

HO HO's , Little DEBBIES and Ding Dongs -- Washed down with a large soda

A bag of Chips -- two hand fulls of Cookies -- And another large SODA

Eat lots of Double Cheese Burgers with bacon and extra cheese -- JUMBO FRIES

How to gain weight?

How To Gain Weight Fast and Build Muscle Mass Naturally

http://www.snac.ucla.edu/pages/Resou...s/HOWtGain.pdf

If that's what you want to do, biggsie, but I couldn't advise any one who wants to gain wait to eat junk food, (all the foods...you metioned above), they are nutritionless, too much sugar, sodium, too high in transfat and saturated fats, and totally bad for blood pressure therefore your heart and general health would suffer. No person will survive long eating like that. Larger portions more often, of good food will work.