A maths science student can do what more except engineering I have not done good in JEE mains so what else can I do ex.- hotel management

You could consider a lot of options when it comes to doing things after your class 12th other than going in for engineering through jee:
BBA - Bachelor of Business Administration

MBA - Master of Business Administration

Marketing Management

Finance Management

Human Resource Management

International Business Management

Operation Management

Event Management

• Retail Management

Law Courses

Animation & Multimedia

Fashion Technology

Visual arts

Literary arts

Performing arts

Aviation & Hospitality Management

Hotel Management & Catering

Mass communication

Languages

There are many career options other than engineering
Merchant navy
BCA
Law
Bba
Bsc in any subject
Bsc in nautical science
Or drop a year and prepare again