Yes, you can appear for the JEE Main in April and apply for Btech/Mtech based on your scores

hi sanket,

you can apply for either one of the exam or both exams.if you appeared for both exams then the best/high among two of them will be taken for admissions.so you can apply for the April examination.

i hope you understand and refer below link:

https://engineering.careers360.com/exams/jee-main

if you need additional information then let us know to help u.

thank you........:D