Hi

In you neet syllabus under the chapter structural organisation in animals , frog and earthworm is not there , there is only brief account on the morphology, anatomy and function of different systems i. e digestive, circulatory, respiratory, nervous and reproductive system for cockroach .

But yes,

it has been seen that many times questions in NEET examination have been asked from earthworm and frog though it is not the part of the neet syllabus .

For example,

in NEET 2017 questions were asked from frog.

So if you are done with your complete  syllabus and if you still have time left  then it's  better if you study , frog and earthworm as well for your neet examination otherwise you can leave frog and earthworm if you don't have time and you can study only cockroach.

Now that, very limited time left for your Neet 2021 examination , you should focus on your neet preparation following the below tips :-

*Go well through NCERT and master it

*Make routine or timetable :-  your routine should revolve around 3 things i.e study, revise and practice

*After finishing each chapter you should practice questions, you should practise at least 80 to 100 numericals / mcqs in Each chapter

*Solve previous year NEET  questions

*Once done with complete syllabus, go through NEET mock test papers

You can prepare well using our neet program  for which link is provided below

https://learn.careers360.com/knockout-neet

Thank you