Hey,
Don't get demotivated, it exam not life.
Yes you spent 1.5 month with full dedication,but you did not get as you expected.
You know what..for GMAT people try 4-5 attempts..they spend 3-4 years..so don't worry..you had just one..if you have desire, dream..then come and get hard..
Before say something I would like to know some details..
1) What is your sectional score?
2) Have you attempted some mocks( atleast free gmac 1,2 mock) , what was your score?
3) What score you are expecting??
Ok, now comes based on your score and that information you provided I would like to tell you one thing GMAT is very smart exam, it's not like university exam that after 5-6 or 1 month's preparation you get good marks. GMAT is for MBA that mean a quality test, what colleges or companies look in suitable candidates. It exam of patience , practice, smart analytical thinking, approach, decision making and time management.
Don't worry, I would suggest, before join any course think before once. Here at GMAT CLUB n number of questions are available for each section. You should practice hard and definitely you will get your desired score. But spend some time at-least 3 months then you will learn from your mistakes and you will not commit that mistakes in exam.
Join test series, join
gmat club tests and there are 5-7 free mocks test available. So don't waste your money..ultimate you are going management person..so think like management guy...everything is available on net at free of cost..give some effort..
Good luck..