Hello aspirant, there should be no problem if you have chosen Gujrati language while filling form for JEE mains. JEE mains paper 2021 will be conducted in 12 different languages and during the time of giving exam you will get the option to see the question paper in the language in which you are comfortable. An option will be provided to you during the login time before the exam start to change the question paper language and you can also change the language after the exam has started. Read the SOP for JEE exam at the official website of JEE mains once admit cards have been released.

For further information and updates on JEE mains exam visit - JEE Main 2021 - Latest News, Exam Dates, Registration, Admit Card, Result, Syllabus, Pattern (careers360.com)

Also to predict colleges based on your JEE main percentile  visit - JEE Main College Predictor 2021 : Predict Colleges based on your JEE Main Rank (careers360.com)

BEST OF LUCK!!