University of Tokyo (PEAK)

i am currently undergraduate student and going to apply for 2020 PEAK program at U.Tokyo so my major is Computer science but facing the some problem (I know only basic Japanese such as everyday conversation) . So, If I enroll myself to PEAK program ( Which only offers JEA and ES), Can I study Computer science after 2 junior years or so ( after which I guess I will be fluent in Japanese)? btw someone who has enrolled or enrolling or anyone who knows why there were many criticizm and negativity of PEAK, is it any better now i mean it has to be, it’s been 4 or 5 years and we are talking about no1 university of Japan xd
Any information about interview questions academic or interest would be APPRECIATED, how hard is academic questions as far i am aiming for scholarships like MEXT or Scholarship of U.Tokyo)?