Hi Karthik,
I don't understand database studio missed up, but you want to reinstall maxdb? Database studio is just a client tool which is not having direct relation with maxdb database/software.
Anyway regarding your question:
1. you need to first drop the db and then reinstall it
2. you need to first drop the database from the maxdb software, then you can drop maxdb software from installation manager
3. you need to take a backup for the database if you want to use the data again, before dropping, the command can be found from:
HowTo - SAP MaxDB Backup with Database Manager CLI - MaxDB - SCN Wiki
Please note you must restore the backup to another testing system, to make sure the backup is valid, before dropping database
Please note without backup, the drop db action is not repairable.
Best regards,
James