User don't seems to mention which exam preparation so , i take it as a JEE/NEET exam for that my opinion is Firstly you have to be Mentally prepared for competitive exams because compilation is more in this time , You can start now ,make good timetable for studies, this is so precious time of your career and this will decide your future career

(1) Make a timetable ,(2) join for coaching classes or use crash courses ,(3)use competitive mcq book ,(4) use youtube if you don't understand the topics (5) solve mock papers to know your potential and improve it

i am giving you a link for crash course of JEE ,if you want to join

Information- https://learn.careers360.com/knockoutfull-jee-main-april/?icn=jee-main-knockout-lpage&ici=search-section_c360-home

tips - https://engineering.careers360.com/articles/how-prepare-for-jee-main

coaching - https://learn.careers360.com/jee-main-coaching/

For NEET

tips - https://medicine.careers360.com/articles/neet-preparation-tips

online cource - https://learn.careers360.com/jee-main-coaching/

hope you get your answer

start now this is the best time, opportunity newer comes twise

and feel free to reply

See candidate you have to do Competition preparation for either Neet or JEE MAINS examination. This is the best time for you to start your preparation because many of the Competitors usually start their preparation in Class 11 only. 2 years are sufficient for any candidate to qualify or crack any Competitive examinations.

If you are preparing for NEET Examination then Career 360 is always with you. Here is the link I am providing for NEET knockout package by Career 360.

https://learn.careers360.com/knockout-neet-may/?icn=neet-knockout&ici=qna

And if you are JEE MAINS aspirant then this the link for the preparation of JEE Mains 2021 provided by Career 360.

https://learn.careers360.com/knockout-jee-main-january/?product=27&icn=knockout-jee-main-2021-january&ici=

Hope you understand this very Well and All the Best..

Start your preparation now itself..