Hello,
Don't worry my friend everyone has a bad day at office. Just try to forget that day and now focus on alternatives. The great option is cmat.
Yes you have bright chances to get into top colleges through cmat. Let me tell you about colleges.

The top B-schools accepting CMAT scores in India which also have the highest cutoff percentiles as follows:

Goa Institute of Management.
SIMSREE Mumbai.
K J Somaiya Institute of Management Studies & Research Mumbai.
XISS Ranchi.

You can check this link for further details about colleges.

https://www.google.co.in/amp/s/bschool.careers360.com/top-b-schools-accepting-cmat-scores%3famp

Cheers !!

What I believe is you can learn from your past. Though CAT didn't go well yesterday yet you got an experience of such exams. CMAT would also be in the similar pattern with a little lower difficulty level and an additional GK section. So buck up from today itself. As a strategy you can do one thing :
1.) Practice two RCs each day. Analyse them thoroughly.
2.) Solve two DI-LR set each day. Analyse them thoroughly too.
3.) Give 5 days each to algebra, arithmetic, geometry and modern maths. This will get completed in 20 days. Grasp the basics and try to solve as many questions as possible. Plus you will have 20 more days in your hand.
4.) Read newspaper and any GK book daily. Give one hour to it.
Once you feel that you are comfortable with the basics, start giving online mock tests. If not daily, try to give three in a week and analyse them thoroughly too.
I am sure your hard work will pay. And one more thing, to get a good college via CMAT, you need to score 98+ percentile.
Do not worry. Just put in all your efforts without thinking of result or outcome now.
All the best!!

Firstly try to get a hold of all the topics in quant. Then start giving mock tests. Give as many as you can as it will help you get better. You will be able to manage your time better and get to know where you need to work upon. Subscribe to online websites like testfunda, oliveboard etc where a lot of people give tests as it will help you get an idea of where you stand. 

You will have to analyse each test you give and know where you need to work upon. Practice makes one perfect and this is absolutely true for competitive exams in India. So the idea is to give as many mock test as you can.

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