Regulation (EU) No 1321/2014 provides in paragraph (b) of 66.A.25 that basic training courses and examinations shall be conducted within the 10 years preceding the application for an aircraft maintenance licence or the addition of a category or subcategory to that licence.

Those modules that have passed 10 years will need to be re-examined if the syllabus of these modules has changed since it was approved until the date on which the license is requested. If the agenda of those modules had not changed, it would not have to be reconsidered.

Applicants who complete basic training at an approved Part 147 organisation and then pass the examinations in another approved Party 147 organisation, will be granted full basic course consideration and, therefore, the reduction of the basic experience requirement will be maximum, eventually remaining within 1 or 2 years. 

On the AESA website:
https://www.seguridadaerea.gob.es/Organisations/Training Organisations/Maintenance Training Organisations (Part 147)

Information on the approval procedure can be found in the Applicant Information Guide FOR-P147-P01-GU01.

Technical requirements on the Organisation Manual can be found in the FOR-P147-P01-DT01 guide.

There is no limitation in the standard or in the EASA guides that prevent a certifier from performing critical tasks in its first year.  
However, the organisation may add additional requirements in its maintenance organisation manual.

A B1 can perform transponder check tasks, as long as: 

• Use automated testing equipment (which does not require previous calibrations)
• Test results are GO/NO GO 
• Be trained in the use of such equipment.