Hello Aspirant

Yes it is sufficient!

Distance Learning Programs are good specifically in the times of COVID-19. DLPs have many advantages like they save you a lot of time for your self studies.

DLPs may lack when it comes to doubt solving sessions, it may sometime create problem to understand a particular topic taught hence the student is advised to go through the coaching material once before the class to clearly understand the concepts taught in the class.

Allen is a huge brand for JEE and NEET aspirants, so yes it is certainly good however it depends more on you whether you'll crack the exams or not. JEE Main requires you to study the basic concepts and you should try to cover as much content as you can, for JEE Advanced there's a different strategy which is to cover the topics which are the most strong for you.

getting 220+ I. JEE mains is not easy though. and If you are opting that flop program and take it seriously and practise good alon with your 11th and 12th syllabus extremely well. Then you can get 220 in JEE mains. Thanks